/**
 *Submitted for verification at Etherscan.io on 2022-03-17
*/

// File: @openzeppelin/contracts/utils/Counters.sol


// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

// File: @openzeppelin/contracts/utils/Strings.sol


// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

// File: @openzeppelin/contracts/utils/Context.sol


// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: @openzeppelin/contracts/security/Pausable.sol


// OpenZeppelin Contracts v4.4.1 (security/Pausable.sol)

pragma solidity ^0.8.0;


/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// File: @openzeppelin/contracts/utils/Address.sol


// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol


// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// File: @openzeppelin/contracts/utils/introspection/IERC165.sol


// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// File: @openzeppelin/contracts/utils/introspection/ERC165.sol


// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;


/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol


// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;


/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol


// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;


/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol


// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;


/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// File: @openzeppelin/contracts/token/ERC721/ERC721.sol


// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;








/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overriden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);

        _afterTokenTransfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        _balances[owner] -= 1;
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);

        _afterTokenTransfer(owner, address(0), tokenId);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits a {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

// File: @openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol


// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Enumerable.sol)

pragma solidity ^0.8.0;



/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;

    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }

        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
}

// File: contracts/MEGALODON.sol


pragma solidity ^0.8.2;






/// @custom:security-contact [email protected]
contract MEGALODON is ERC721, ERC721Enumerable, Pausable, Ownable {
    using Counters for Counters.Counter;
    using Strings for uint256;
    Counters.Counter private _tokenIdCounter;

    string baseURI;
    string public baseExtension = ".json";
    uint256 public cost = 0.15 ether;
    uint256 public maxSupply = 500;
    uint256 public maxMintAmount = 5;
    bool public revealed = false;
    string public notRevealedUri;
    uint256 private _totalReleased = 0;

    uint256 public revealDelay = block.timestamp + (100 * 365 days);
    uint256 public claimsOpen = block.timestamp + (100 * 365 days);
    uint256 public whitelistEnd = 0;

    mapping(uint256 => address) private _claimed;
    mapping(uint256 => bytes4) private _hash;
    mapping(address => bool) private _whitelisted;

    address[] private whitelist = [
        0x1d001DbfF5c2859e38D5052500F98D0D86b5E517,
        0x4Ab1e214C3E93cFE63A83222625c8Ea9BCd75191,
        0x9BB90CB2c6A782cac8d6f83Cf364D629Cdb8b93E,
        0x8d9598616BBEB080368b84Ff6A6C93879dd63853,
        0x8ef1d0198E14daf7B8537e2C3A9F1cbBfd23EDc6,
        0x58C83a9789E652DCdBd9D1eE254E2E4C4E23E456,
        0xeBc4E294408b764ede5b834535Ae7eE2d99Fbdaa,
        0x7f2E8F1fAB6a05343236Ee03561fF721fCceEeD1,
        0xb4187C5fAb62A8a5f7F7d26f10AE68Fa88AFcF8B,
        0x888ed85a578a5F5E3CCd1a61456d406bC5783F00,
        0xC32F3cb482b36f5B26C164157ceDE298D711aA0E,
        0x3eDEA7DD2F1F3eecD2346c0d586B8292b90169Cc,
        0x9834e1Cd9a24FDA4f53f5DFDEF324C88a99dbE13,
        0xFcFBbce2E8373Fe3A064b22Bc4E2519b4DAa6cA1,
        0xE73B3E5F096A234a3d2f7a447eCa3af04AE03098,
        0xEc679104c73e9B87b828066A211425F84154e2F6,
        0x9176516DB3D24A58bf32E666763baa53306789fc,
        0xc955c68C2E255764C3BcD75379F58e741a511746,
        0xc3Dc831a852df51b2977b0ca66758fe559C6E02C,
        0xdd417B717FC0E3357fc220F77A047430AFe9b1DA,
        0x418b6DF1789f3426375c2A04fd1d5e693a2a443B,
        0xF870de6bEbC8c3189fCED0D34c1741D78B63571F,
        0x334d1611C1c9cF92527914287832454FA1B7e47E,
        0xd23B065Fe79741658f3AD7758C298C55D8336FEE,
        0x965712f1841c157F5054905aACF34c164aDbF4E9,
        0xCd0f2A7ec109bA2236112e6DC8C6FA30d5a6De83,
        0xe300C56E979f53e2F24d5A360fE20bBeBD673ae8,
        0x02700Ef29404B325e37D6Cd8CC4f528BadC13fF2,
        0xCdF7cedf2f6f1B8F93F082Cf4dad82372BA1CE33,
        0xa83c3f6592D0D3a8331B13c5e86A38ea7e1aEB94,
        0xea5C3EA1d5c87cAf600afb1B007A77152d8BE156,
        0x007855EfAbaa6B76B3ce12033BF7958f8fe7A894,
        0x5D70335242e573b9573CDE8f03d57A76fD75138d,
        0x6dA8Ca016eefE798986EB79110DeB1a9dFc42844,
        0xBFAe5a21a05Db297f8C5D1d9A72251E7A7547A18,
        0x0b64B1DAcc737e94193a1f4b927c1cDf6FF894CD,
        0x04Ed859145A52555Dfa4b29190B1BccE2f5d83F2,
        0xCC733B12AB73dc285577613e9cE47c65f2925573,
        0x745B8255416611d86aa0bdAD5A5BA860Cc15a8aa,
        0x2E47bC24099cB9d4De1073C2f09C2B46De3Bd126,
        0xE4bF0C0B4143BBC3A578367EbBD5303AD89E9152,
        0xDe9aD2f4a745b3E26EB884229719A83E4170E00E,
        0xCd93B8b7DeAbD9835220c299dd10aB18a58853f5,
        0xCb32d99541d309F6731A7438F3758893A2089A0e,
        0x8dbE849d83Ef3FD9025749A142f38817e5a1A81a,
        0x9576a202ED9d8362A55308CA5a9a307E86bf577a,
        0x515e31871de8652c6d980D733f062624B649e738,
        0xa30b673453694396844e743ba038735679FeCf3c,
        0xd0CE51096ef3c6DeEd20A2de4cC83754fD9f75aF,
        0x79DCF26B19f908eB1f3fF5FA4CF109E13f6096e2,
        0x7Ad14DA53D61c835B22E849e5C925F96ff87f564,
        0x446aA11D64353e38029dd88aA21ef53aEEA3214a,
        0xA1A87CD73FB1a72bd04aF7D7027135A2642e7480,
        0x46307b2B53Be4aC54B6dE2EeF3a08fC9158b4432,
        0xc8D23B6Fb17Fd6f44Ee6d25e5c9Ae49848575d85,
        0x4B58FEB67dD91492Aa77f20dE915a6F502e92A56,
        0xe12fE5bd417Ca3781CF1567e9f076a35249F1dEe,
        0x2317ABDe4AfBfbDd024E634d72f2bDdB29Ee949f,
        0x3a6Bc443C9324870D02beDbbfd93B8d7B76acCBb,
        0x393B6d1C29857B35558368A91eE2eeEcc8De5fbE,
        0xb261684d90b84d48ED3f1CE22F998a1071ba240D,
        0x75DaD8e19E1c04E7C216Cd3AD1B1CADbEE01cD36,
        0xF7A4BEd6ffa24BFD4533A303CBB51e6671f035F0,
        0x3Fe4fcD6573f0b7Af4925BB7d30Eb1C590cDF9f3,
        0xD26E7C178C7e6a86Cc2eD583ec71bB92cA52aff1,
        0x55Fc3B06B4a2a9923DbD352Aba748bc8298DB7C8,
        0xDd2bdD0E8fd81c6eC5B4d1D66975aa6B7842bC02,
        0x0Acf39F0c14934D0a3e1D2C81aEE3E6ebB4f3c0F,
        0x9FcF6addb37fbDd649E893e5ca6c23109C3BeBdc,
        0x2A002ad4ff108Aee5d8F7Fa9b7B15bFd170bafCA,
        0xF1511802EfaEA30E275864dc8b76E1cBF1F4be10,
        0xE980fC55493c68e3E389981872c164D296fB7668,
        0xFAff7324A5447E5F207716ba92Fde1Db3955Db9A,
        0x798f3A389c02201170f2d950369CfC9508c9bDB0,
        0x5e94E7D280554cBf8786c6e026432015277DD59c,
        0x285EBB39DcF752E053c8b647a0C655B9BD19A08f,
        0xE9F9E6a10115C1cA4a90a1BA5d3235e6389CB216,
        0xf1FdE04Aa1802A8444c6572C377aFf69dD14edf7,
        0xb6108e0EdC54Eb82645b54ee39f44319Edd70Cb8,
        0x5F4907FB6E94b35EAc502DC4cAc4d65A10e2fA16,
        0xC0964819A7272429f9Aa2c22ef4Ef8faA1aA20A4,
        0xf5eA2Ba9FC55E75D2eD43cf5f78F52481ee7D42D,
        0xabDaF8dBFa933E0A3A255a4AE615b6b3Df7C7F29,
        0x9aD31154c76fF7690e1582b02b8B0D050A560368,
        0x51ED2A05253F92Ed96ddAb165AE36c5e60Baa350,
        0x5FDe84B35484285C71B1a2f68eE665025aa0785D,
        0x935889AaD699F56B1384a07456Ce8Ffe41952915,
        0x32fe3f1D592CE4d9A0A8c5D30bCDecDB980b8baD,
        0xA0dA61A84dEB0235DFE4129D2e573F2288d69855,
        0x823dB597Fd3428F8b92A4f9e4f31d220C0Ce22A3,
        0x57C9F224b2F0A2BC8007f17324088105D1DFBC01,
        0xfeD0E5ACed47BeEF33F8299C4bbf1ebd2A47e399,
        0x902df898445de8bd3F31dE1EAD6c8b19319C7325,
        0x3d03BafFF21C0AA34f05acb30420015ED89Cc6D6,
        0x27946D55dDCbF907d9ddCAd1c3b74Ca164D96871,
        0x4B88085BB7e1340a21d814e5Aec889c07b7298A6,
        0x5f8BD26342c7bA88483F5E4Fd88B04AE4444881B,
        0x0a2Ec3eFa6aF841A2D553c68263f19E546A77b1C,
        0xe3aE480ba711B7c5bA7c7dc2A4C9F8CaE77dB0ab,
        0xD7Ee0a651D1D824157e58049A81E6990A04bf219,
        0x61d76eBf2c8BE56048dB75F6d2636d25FAB03BFB,
        0xc3791B232FC913D2299D9B5dDA3E180306EE42Ae,
        0x9AF5b114b3153f599827a8FCfF5bed7D334714dA,
        0x11df71972DC3062A3736968c5C6E20942e109Fca,
        0xF7a80B1954A55B885554f198706441b2eD23F832,
        0x91e65897D70AC4c73d118830b48b5DA5809BcCa5,
        0x8eCD4c4C6571FC7650dF2D8CeBdf24f102b4ab9D,
        0xE8b24e3Dc2934c68da0De5458cb32DE34aa62e04,
        0xD0225dB3BDC8108B04C7834Bdca066ed138E308f,
        0x40ec638BdB921D0A01629297A30FfF248DC46Efa,
        0xb28D3c293a4ebE90aC4488E5077660458Be8fE9a,
        0xA7727572221f386ebc884179Adf7e4B6938b9753,
        0x47d359aEEc83BA1bc8A775f5680b8b5d6353A0B4,
        0x0945317DdE1e541c3a49774E58Ffb719672ac3C1,
        0x71F5359d4950cAD207C40537d1c2311588A1bc9A,
        0x3e88B0FF49b087Ba1Ba978d505e94963c2fe0409,
        0x58951C0ac4e2e7D6A4DC9bEe727c08CF673ACadE,
        0x0911Bde35B5414AFa979bF7B03ab9DF511ce3447,
        0x8662171F751cb5c5d7e9C04c22E5b6898a986b42,
        0x30CE5975C572d4327523cCE630Fd9Fa5e8197b31,
        0x676708910Ae61fCf538CCd263007dD4f90505c26,
        0xc24a95aB81d0aF0fe44BB5e6a9e63D4315d9E6d8,
        0x0AEf86620A99b97A567A09d916b8085aD100bF3c,
        0xB6EE24eC8998B31920Dfb5cC15Ac0C410aE12d41,
        0x6489d3E2dE66f5c6e4e5fB95e9c7913397101663,
        0x6E4756f17545451A0E446f83677451e1934b3B5F,
        0x4327DBF2e5D9C5Ba708a98f5A2E91cb5c5288beB,
        0x0b3E1b0E3da1a10137c80700b19Fe31d42206c1b,
        0x3e8e7335E1Fc17946B5C2Eb18206DEE439Bc0984,
        0xbC0EF0997FF17D9Cd34835bc7B8A0772c00fd910,
        0x0A97CC7E28d5819cE6aa504CE3782307c250BCD1,
        0x5e9D5CEe343bDA45a06A192b93Dc99bE03285237,
        0x0fA7862582A369BaAb12d32948964EE6dD1dC239,
        0xF980baDd38f56a4b2EfCf950DC076D50B4E76033,
        0x6E2fdF2A239584E962DA19827e3C6B8cf12A4CA2,
        0xf77Aa04c7c76de3891ad8e337838CbEE8bDd6aAE,
        0xc3b6406ae2F6B64C5ED2B229f7C8558130Dd7A5F,
        0x78a7b2ba29228B0161aD7aEB13F1eE19Bd85B679,
        0x37aD728eD9Be443447f64D8250Dda92a5370677C,
        0x17EC1C58dBe2659591D3E43BfEd61506ba4C8FeD,
        0xA79A874d1E25e877531dBaC167408cA329221031,
        0x3a37641931c4BE82341BE3C3b510a453Efdd9d57,
        0x4b52EE1a51bd532533ed3dFb38C5032D91B3aa9d,
        0x7081D7E76A2f0d4A6D1B803Db5FE96BbA54BDE1d,
        0xa5abcbBC3728535BDc61f8EE477E04dE54D04299,
        0xBa372850008B934772D8102B7435AF3527a09e66,
        0xB7aeAB7a9ce69be3F6430AF828c2da8475BFC5c1,
        0x855CF620D17C4c9Ee518872815979a7D3389E6FE,
        0x92242767fCc93D2c217aB851254Ff59851B62DeE,
        0x3397463bCb05EfDa0451C6B2e8Ee8a8a696a740A,
        0x5FF0312D09e6fc30639627616e75A43054816F0e,
        0x897dBB5927174e9fE75E42E27D3D5C37DBF18CCB,
        0x5298e36467595DF73c6d9Ab17c19c1120B6bd8ea,
        0xE24D35506483006355053a0b7B3CCba5aFD5f348,
        0x2dc09e1317a1dD52c8cB5fBF581ba80F3b7B0DD1,
        0x5b4c6663be2cbe6012cF4ad3a9BaA42745b1e692,
        0x13c76ac0fB750e16eE63C14CdC8f0bafB7830581,
        0xa93A146eE7858bf8B945eB6dE0Db9D8c2Fc7a500,
        0xD09618ebB6d6B4dCA3c0f70aE4b99C4E012B03a0,
        0xD044E66a1172e35fCbe54d82638b49E245F3911E,
        0xF53a213768Bb95f12500Cc5A89115DDb871ea1f2,
        0x7F808Ffa2Cb81E94C50414218eAc637B9802027F,
        0x09c7dFd9869e26b25a588341CBB75D48d0194a1B,
        0x078c94115730e25104F28BcF6C614D1a89921037,
        0xd75175D8BC713E9a9085a393F4a267c3Afd93671,
        0x182D0031853Bfe854CD190dE6c39278F58285c4b,
        0xc3286F270849f135f5CC035C7423b2D89C35b306,
        0x5D5cD6311eFfe6799a4Ff0ce5b76691f5Fd4797F,
        0xd5C00626210Af17c3c02b5Af3f4a688ec202f32F,
        0xEA77e2e0fB080aDe2D4B631687f39f7AE4a20B92,
        0x9cAcC46e76b9bD962DfD2759bae6C6E9599383aF,
        0xeaD58840F4fBc09949014E373f92167775472c3D,
        0x1612e299BBCDFBf44B079a625c1Be69372075918,
        0xdf9B6D388b22bA05D98aBA843fb8DAb7f7D340F8,
        0x7041f7A2994dF564361549886f2af63F5fdc15E9,
        0x52FDBd64286D4C16098d5e13593F9233CeF9Db18,
        0x5573fE7423d574eBaCEEb7B601446b96Afb2dc10,
        0x2922a915639e7bB9723AC5f8E8EC4c9F0795b68f,
        0x6f780A7EC15F27E8977877e290f7049360aD60D5,
        0x72E696F7CDd6E0A863892BD1a9E9f757555fA616,
        0x7C4996c5D0f9cc4f3220824c68Da2D0Feab61Bb6,
        0xa79Badd4b28671981D624cB54E66319B0Afd36eA,
        0xd4aE647CfF5500c7c1447DdE84981f39366DEE44,
        0x7d68c5d1070586F426cd2d1F1Aad4e5fF7FB58dF,
        0xbD04AF87B9C2E08c11fA46402dB2166F2Eb679c3,
        0x3cf1A37B5BeD1e1333a767F8d19C30E2D29c5765,
        0x679412E558F5F5e66991ae7eaB2fd4e0A277eB8E,
        0x58dcCe97c86D473C8246e0d413d349082833Eb87,
        0x302fc4a9A818523Eeb5a46E70534F71bee625765,
        0x42C95630a75900fE417454f1F142221A54820D3e,
        0xE2434C695c69FBA085eF5F285C11c716b8D03631,
        0xCdF7cedf2f6f1B8F93F082Cf4dad82372BA1CE33,
        0x6dA8Ca016eefE798986EB79110DeB1a9dFc42844,
        0x04Ed859145A52555Dfa4b29190B1BccE2f5d83F2
        ];

    constructor(
        string memory _name,
        string memory _symbol,
        string memory _initBaseURI,
        string memory _initNotRevealedUri
    ) ERC721(_name, _symbol) {
        setBaseURI(_initBaseURI);
        setNotRevealedURI(_initNotRevealedUri);
        _pause();
       for(uint256 i=0; i<whitelist.length; i++)
        {
            _whitelisted[whitelist[i]] = true;
        }

    }

    function mint(uint256 _mintAmount) public payable {
        uint256 supply = totalSupply();
        require(!paused(), "the contract is paused");
        require(_mintAmount > 0);
        require(
            _mintAmount <= maxMintAmount,
            "exceeds max allowed mint in one action"
        );
        require(
            supply + _mintAmount <= maxSupply,
            "exceeds max allowed token supply"
        );
        require(
            _whitelisted[msg.sender] || (block.timestamp > whitelistEnd),
            "Only whitelisted addresses allowed at this time"
        );
        if (msg.sender != owner()) {
            require(msg.value >= cost * _mintAmount);
        }

        for (uint256 i = 1; i <= _mintAmount; i++) {
            _safeMint(msg.sender, supply + i);
        }

        if (totalSupply() >= maxSupply) {
            claimsOpen = block.timestamp + 9 days;
            reveal();
        }
    }

    function setCost(uint256 _newCost) public onlyOwner {
        cost = _newCost;
    }

    function addToWhitelist(address _newWhitelist) public onlyOwner {
        _whitelisted[_newWhitelist] = true;
    }

    function whitelisted(address _address) public view virtual returns (bool) {
        return _whitelisted[_address];
    }

    function balance() public view onlyOwner returns (uint256) {
        return address(this).balance;
    }

    function totalReleased() public view onlyOwner returns (uint256) {
        return _totalReleased;
    }

    function totalIncome() public view onlyOwner returns (uint256) {
        uint256 _totalIncome = address(this).balance + _totalReleased;
        return (_totalIncome);
    }

    function withdraw() public payable onlyOwner {
        uint256 withdrawalAmount = address(this).balance;
        (bool success, ) = payable(msg.sender).call{
            value: address(this).balance
        }("");
        require(success);
        _totalReleased += withdrawalAmount;
    }

    function pause() public onlyOwner {
        _pause();
    }

    function unpause() public onlyOwner {
        _unpause();
        whitelistEnd = block.timestamp + 6 hours;
    }

    function setClaimsOpen(uint256 _date) public onlyOwner {
        claimsOpen = _date;
    }

    function setRevealDelay(uint256 _date) public onlyOwner {
        revealDelay = _date;
    }

    function setWhitelistEnd(uint256 _date) public onlyOwner {
        whitelistEnd = _date;
    }

    function claimed(uint256 _id) public view virtual returns (address) {
        return _claimed[_id];
    }

    function hashClaim(uint256 _id) public view virtual returns (bytes4) {
        require(
            (msg.sender == ownerOf(_id)) || (msg.sender == owner()),
            "You are not the owner of this token."
        );
        return _hash[_id];
    }

    function hash(address _addr, uint256 _id) private view returns (bytes4) {
        bytes32 result = keccak256(
            abi.encodePacked(_addr, _id, block.timestamp)
        );
        return bytes4(result);
    }

    function claim(uint256 _id) public {
        require(
            (block.timestamp > claimsOpen),
            "Tooth claiming has not yet been opened."
        );
        require(
            (_claimed[_id] == address(0)),
            "This tooth has already been claimed."
        );
        require(
            (msg.sender == ownerOf(_id)),
            "You are not the owner of this token."
        );
        _claimed[_id] = msg.sender;
        _hash[_id] = hash(msg.sender, _id);
    }

    function approve(address to, uint256 tokenId) public override {
        super.approve(to, tokenId);
    }

    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        super.transferFrom(from, to, tokenId);
    }

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        super.safeTransferFrom(from, to, tokenId);
    }

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        super.safeTransferFrom(from, to, tokenId, _data);
    }

    function getApproved(uint256 tokenId)
        public
        view
        virtual
        override
        returns (address)
    {
        return super.getApproved(tokenId);
    }

    function setApprovalForAll(address operator, bool approved)
        public
        virtual
        override
    {
        return super.setApprovalForAll(operator, approved);
    }

    function isApprovedForAll(address owner, address operator)
        public
        view
        virtual
        override
        returns (bool)
    {
        return super.isApprovedForAll(owner, operator);
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal override(ERC721, ERC721Enumerable) {
        super._beforeTokenTransfer(from, to, tokenId);
    }

    function _burn(uint256 tokenId) internal override(ERC721) {
        super._burn(tokenId);
    }

    function _baseURI() internal view virtual override returns (string memory) {
        return baseURI;
    }

    function tokenURI(uint256 tokenId)
        public
        view
        override
        returns (string memory)
    {
        if (revealed == false) {
            return notRevealedUri;
        }

        if (revealDelay >= block.timestamp) {
            return notRevealedUri;
        }

        require(
            _exists(tokenId),
            "ERC721Metadata: URI query for nonexistent token"
        );

        string memory currentBaseURI = _baseURI();
        return
            bytes(currentBaseURI).length > 0
                ? string(
                    abi.encodePacked(
                        currentBaseURI,
                        tokenId.toString(),
                        baseExtension
                    )
                )
                : "";
    }

    function supportsInterface(bytes4 interfaceId)
        public
        view
        override(ERC721, ERC721Enumerable)
        returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }

    function walletOfOwner(address _owner)
        public
        view
        returns (uint256[] memory)
    {
        uint256 ownerTokenCount = balanceOf(_owner);
        uint256[] memory tokenIds = new uint256[](ownerTokenCount);
        for (uint256 i; i < ownerTokenCount; i++) {
            tokenIds[i] = tokenOfOwnerByIndex(_owner, i);
        }
        return tokenIds;
    }

    function reveal() public onlyOwner {
        revealDelay = block.timestamp + 2 days;
        revealed = true;
    }

    function setmaxMintAmount(uint256 _newmaxMintAmount) public onlyOwner {
        maxMintAmount = _newmaxMintAmount;
    }

    function setMaxSupply(uint256 _newMaxSupply) public onlyOwner {
        maxSupply = _newMaxSupply;
    }

    function setNotRevealedURI(string memory _notRevealedURI) public onlyOwner {
        notRevealedUri = _notRevealedURI;
    }

    function setBaseURI(string memory _newBaseURI) public onlyOwner {
        baseURI = _newBaseURI;
    }
}