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Relation: subclass

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BinaryRelation1311BinaryRelations are relations that are true only of pairs of things. BinaryRelations are repres...^
    SymmetricRelation38A BinaryRelation ?REL is symmetric just iff (?REL ?INST1 ?INST2) imples (?REL ?INST2 ?INST1), for...^
        EquivalenceRelation6A BinaryRelation is an equivalence relation if it is a ReflexiveRelation, a SymmetricRelation...^

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