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something is a person if it is either Adam or Eve, or if it has a mother. We can express this in a single rule as follows:
person(X) :- (X=adam; X=eve; mother(X, Y)).
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this post was submitted on 03 Jan 2025
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mother can be used in several ways. If both X and Y variables are uninitialized, then it looks for all mother relationships. If one of them is initialized, it looks for matching relationships. If both are initialized, it returns true if such a relationship exists.