Why is my recursive prolog script not working?

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Can anyone help me out with Prolog recursive functions?

I have to type in a recursive input and it should give me true, but it gives me an error and I sitll don´t know how to figure it out

Bob(Food(X)):- Bob(X).
Bob(eat(X)):- Bob(X).
Bob(yummy(X)).

Is what I have and Input Food(Food(eat(yummy)))should result in true

But I get an Error: Unknown procedure: Food/1 (DWIM could not correct goal) this is basically the whole story.



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