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 y_2: S(y_2) -> W(y_2). W(g) <-> S(g).
W(g) -> S(g) can be inferred via the biconditional elimination rule. S(g) -> W(g) can be inferred via the biconditional elimination rule.