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Predicate orc/3
 orc(++A:couple, ++B:couple, --AorB:couple) is det
A and B are couples (Environment, BDDA) and (Environment, BDDB) respectively Returns in AorB a couple (Environment, BDDAorB) where BDDAorB is pointer to a BDD belonging to environment Environment representing the disjunction of BDDs BDDA and BDDB.