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: ~w. S_4(a_16) -> p_17. forall z_2: S_4(z_2) <-> W(z_2). p_17 -> w.
~p_17 can be inferred via the modus tollens rule. S_4(a_16) -> w can be inferred via the transitivity rule. forall z_2: S_4(z_2) -> W(z_2) can be inferred via the universal biconditional elimination rule. forall z_2: W(z_2) -> S_4(z_2) can be inferred via the universal biconditional elimination rule.