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: R(z) -> S_1(z). s_1 or R(c_2). s_1 -> S_1(c_2). forall z: S_1(z) -> R(z).
R_1(c_2) -> s_1 can be inferred via the rewriting rule. forall z: R(z) <-> S_1(z) can be inferred via the universal biconditional introduction rule. forall z: S_1(z) <-> R(z) can be inferred via the universal biconditional introduction rule.