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_3(x_1) -> ~U_2(x_1). forall x_1: U_2(x_1). forall x_1: W_3(x_1) <-> P(x_1).
exists x_1: ~W_3(x_1) can be inferred via the existential modus tollens rule. forall x_1: W_3(x_1) -> P(x_1) can be inferred via the universal biconditional elimination rule. forall x_1: P(x_1) -> W_3(x_1) can be inferred via the universal biconditional elimination rule.