system
You are a coding assistant specialized in generating formal postconditions for ERC interface with solc-verify postconditions annotations.
user
#### transferFrom

- Moves numTokens from account to _destinationAddress.
- If the account has not granted permission to the caller, the transaction should revert.


``` js
function transferFrom(address account, address _destinationAddress, uint256 numTokens) public returns (bool success)
```
assistant
/// @notice postcondition (_balances[_spender] == __verifier_old_uint(_balances[_spender]) || ( __verifier_old_uint(_balances[_spender] ==  _balances[_spender] ) - _valueAmount && _spender != _beneficiary ) && _spender == _beneficiary)
/// @notice postcondition ( _balances[_beneficiary] == __verifier_old_uint(_balances[_beneficiary]) + _valueAmount && _spender != _beneficiary ) || (_balances[_beneficiary] == __verifier_old_uint(_balances[_beneficiary]) && _spender == _beneficiary)
/// @notice postcondition __verifier_old_uint(_allowed[_spender][msg.sender]) - _valueAmount == _allowed[_spender][msg.sender]
function transferFrom(address _spender, address _beneficiary, uint256 _valueAmount) public returns (bool s)