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(i). forall x: P(x). forall x: S_1(x).
exists x: W(x) can be inferred via the existential generalization rule. forall x: P(x) and S_1(x) can be inferred via the universal conjunction rule. forall x: S_1(x) and P(x) can be inferred via the universal conjunction rule.