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Relation: subrelation

direct-childrendocumentationgraph
    grandparent2(grandparent ?YOUNGER ?OLDER) means that ?OLDER is a parent of ?YOUNGER's parent.^
        grandmother.(grandmother ?PERSON ?PARENT) means that ?PARENT is the grandmother of ?PERSON.^
        grandfather.(grandfather ?PERSON ?PARENT) means that ?PARENT is the grandfather of ?PERSON.^

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