For the contract below

contract Example
    using SafeMath for uint256;

    uint256 internal _amount;

    function example(uint256 amount)
        _amount = _amount.add(amount);

after compiling to EVM bytecode, the SafeMath.add(uint256,uint256) should appear defined in the code.

anyone knows how to calculate the keccak256() signature for this function? what should I look for in the contract bytecode?

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