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13.22. The Conditional Element Forall
This element evaluates to true when all facts that match the first pattern match all the remaining patterns. It is a scope delimiter. Therefore, it can use any previously bound variable, but no variable bound inside it will be available for use outside of it.
Forall can be nested inside other CEs. For instance, forall can be used inside a not CE. Only single patterns have optional parentheses, so with a nested forall parentheses must be used.