What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: forall x: P_2(x) -> W(x). exists x: S_1(x) -> P_2(x). forall x: W(x) <-> S_1(x).
exists x: S_1(x) -> W(x) can be inferred via the existential transitivity rule. forall x: W(x) -> S_1(x) can be inferred via the universal biconditional elimination rule. forall x: S_1(x) -> W(x) can be inferred via the universal biconditional elimination rule.