What potential problems could come up if I tried to use a function without knowing what it does or how to interact with it?

You won't get the result you are expecting. Or you may get a result, you just don't know what it represents. Or the function could do any number of other things that may effect values already stored in the instance of the class that you weren't intending. It all depends on what the function is and how dependent other things are on it.

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