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) -> ~P_3(x_1). forall x_1: T_4(x_1) -> W(x_1). forall x_1: W(x_1) -> T_4(x_1). forall x_1: P_3(x_1).
exists x_1: ~W(x_1) can be inferred via the existential modus tollens rule. forall x_1: T_4(x_1) <-> W(x_1) can be inferred via the universal biconditional introduction rule. forall x_1: W(x_1) <-> T_4(x_1) can be inferred via the universal biconditional introduction rule.