rsasak_forward_wa_star_h_add:pairfrom/4

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Predicate pairfrom/4

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pairfrom(?Set, ?Element1, ?Element2, ?Residue) is semidet[private]: is true when Set is a list, Element1 occurs in list, Element2 occurs in list after Element1, and Residue is everything in Set bar the two Elements. The point of this thing is to select_20_faster pairs of elements from a set without selecting the same pair twice in different orders.