What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists y: W(y). forall y: W_3(y) -> W(y). forall y: W(y) -> W_3(y).
exists y: W_3(y). forall y: W_3(y) <-> W(y). forall y: W(y) <-> W_3(y).