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Excuse me, what data should I pass in _data bytes when I call tokenFallback and transferAndCall and approveAndCall?

 function transferAndCall(address _recipient, uint256 _amount, bytes _data)

 function tokenFallback(address sender, uint256 _value, bytes _extraData)

 function approveAndCall(address _spender, uint256 _value, bytes memory _extraData)

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