dif:or_succeed/1

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Predicate or_succeed/1

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or_succeed(+OrNode) is det[private]: The dif/2 constraint related to OrNode is complete, i.e., some (sub)terms can definitely not become equal. Next, we can clean up the constraints. We do so by setting the OrNode to - and remove this dead OrNode from every vardif/2 attribute we can find.