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Prolog: lowest common ancestor (LCA)
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| ancestor(A, B) :- parent(A, B). | |
| ancestor(A, B) :- parent(X, B), ancestor(A, X). | |
| lca(A, B, X) :- ancestor(X, A), ancestor(X, B). |
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This won't give you the lowest common ancestor, but the complete list of common ancestors.