What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z: ~W_1(z). q_2 or t. q_2 <-> W_4(a). forall z: Q(z) <-> W_1(z). forall z: Q(z) <-> W_4(z).
q_2 -> W_4(a). W_4(a) -> q_2. forall z: Q(z) -> W_1(z). forall z: Q(z) -> W_4(z). forall z: W_1(z) -> Q(z). forall z: W_4(z) -> Q(z). forall z: ~Q(z).