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 z: T(z) or R_1(z). forall z: ~T(z) or Q_1(z). forall z: R_1(z) -> S_4(z). exists z: Q_1(z) <-> S_4(z).
forall z: R_1(z) or Q_1(z) can be inferred via the universal resolution rule. exists z: Q_1(z) -> S_4(z) can be inferred via the existential biconditional elimination rule. exists z: S_4(z) -> Q_1(z) can be inferred via the existential biconditional elimination rule.