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: u -> q_1. ~S_17(a_17). forall x_17: R_17(x_17) -> S_17(x_17). q_1 -> u. u -> R_17(a_17).
q_1 -> R_17(a_17) can be inferred via the transitivity rule. u <-> q_1 can be inferred via the biconditional introduction rule. q_1 <-> u can be inferred via the biconditional introduction rule.