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 z: W_3(z) -> S(z). forall z: W_3(z) or P(z). forall z: P(z) -> S(z). W(a_1).
exists x: W(x) can be inferred via the existential generalization rule. forall z: S(z) can be inferred via the universal disjunction elimination rule.