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: exists x_1: W(x_1) <-> S(x_1). forall x_1: S(x_1) or ~W(x_1).
forall x_1: W(x_1) -> S(x_1) can be inferred via the universal rewriting rule. exists x_1: W(x_1) -> S(x_1) can be inferred via the existential biconditional elimination rule. exists x_1: S(x_1) -> W(x_1) can be inferred via the existential biconditional elimination rule.