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predicates nondeterm grandparent(symbol, symbol). nondeterm parent(symbol, symbol). nondeterm kid(symbol, symbol). nondeterm sibling(symbol, symbol). clauses /*Dad's branch*/ parent("Sergey","Evgenij"). parent("Tatyana","Evgenij"). parent("Evgenij","Kirill"). parent("Evgenij","Bonya"). /*Mom's branch*/ parent("Vladimir","Oksana"). parent("Nina","Oksana"). parent("Oksana","Kirill"). parent("Oksana","Bonya"). /**/ sibling(F,S):-parent(M,F) and parent(D,F) and parent(M,S) and parent(D,F). kid(C,P):-parent(P,C). grandparent(GP,C):-parent(GP,P) and parent(P,C). goal grandparent("Vladimir", "Kirill").
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