dif:dif_c_c/3

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Predicate dif_c_c/3

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dif_c_c(+X, +Y, !OrNode)[private]: Enforce dif(X,Y) that is related to the given OrNode. If X and Y are equal we reduce the OrNode. If they cannot unify we are done. Otherwise we extend the OrNode with new pairs and create/extend the vardif/2 terms for the left hand side of the unifier as well as the right hand if this is a variable.