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: Q(y) -> W_4(y). forall y: T_1(y) -> Q(y). forall y: W_4(y) -> T_1(y). exists y: T_1(y) <-> Q(y).
forall y: Q(y) -> T_1(y) can be inferred via the universal transitivity rule. forall y: T_1(y) -> W_4(y) can be inferred via the universal transitivity rule. forall y: W_4(y) -> Q(y) can be inferred via the universal transitivity rule. exists y: T_1(y) -> Q(y) can be inferred via the existential biconditional elimination rule. exists y: Q(y) -> T_1(y) can be inferred via the existential biconditional elimination rule.