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: p_15 <-> q_15. ~q_15. p_15 -> q_15. q.
~p_15 can be inferred via the modus tollens rule. ~q_15 and q can be inferred via the conjunction rule. q and ~q_15 can be inferred via the conjunction rule. p_15 -> q_15 can be inferred via the biconditional elimination rule. q_15 -> p_15 can be inferred via the biconditional elimination rule. ~p_15 can be inferred via the biconditional elimination rule.