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: T(y) -> T_2(y). forall y: T_2(y) <-> W_1(y). forall y: T(y) <-> W_1(y).
forall y: T_2(y) -> W_1(y) can be inferred via the universal biconditional elimination rule. forall y: T(y) -> W_1(y) can be inferred via the universal biconditional elimination rule. forall y: W_1(y) -> T_2(y) can be inferred via the universal biconditional elimination rule. forall y: W_1(y) -> T(y) can be inferred via the universal biconditional elimination rule.