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Learn Python - Object-Oriented Python - code challenge

So the entire course Kenneth uses args and kwargs(with a S at the end) but in one of the code challenges I couldn't figure out why it wouldn't pass. Come to find it's because it was arg and kwarg without the S.

Is there a reason args and kwargs wouldn't work compared to without the S on the end? Is it a mistake or is there actually two types of args/kwargs?