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: q_1 -> p_8. ~S_4(a_17). forall x: P_4(x) -> S_4(x). p_8 -> q_1. p_8 -> P_4(a_17).
q_1 -> P_4(a_17) can be inferred via the transitivity rule. q_1 <-> p_8 can be inferred via the biconditional introduction rule. p_8 <-> q_1 can be inferred via the biconditional introduction rule.