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 y: W(y) <-> P_1(y). forall y: W(y) -> T_4(y). forall y: T_4(y) <-> P_1(y).
forall y: W(y) -> P_1(y) can be inferred via the universal biconditional elimination rule. forall y: T_4(y) -> P_1(y) can be inferred via the universal biconditional elimination rule. forall y: P_1(y) -> W(y) can be inferred via the universal biconditional elimination rule. forall y: P_1(y) -> T_4(y) can be inferred via the universal biconditional elimination rule.