function random() internal view returns (bool) {
        uint maxRange = 2**(8* 7);
        for(uint8 a = 0 ; a < 8; a++){
            uint randomNumber = uint( keccak256(abi.encodePacked(msg.sender,blockhash(block.number), block.timestamp )) ) % maxRange;
            if ((randomNumber % 13) % 19 == 0){
                return true;
                break;
            }
        }
        return false;    
    }