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_14 -> ~q_14. q_3 or ~u. q_3 -> u. q_14. q_3 <-> p_14.
~p_14 can be inferred via the modus tollens rule. u -> q_3 can be inferred via the rewriting rule. q_3 -> p_14 can be inferred via the biconditional elimination rule. p_14 -> q_3 can be inferred via the biconditional elimination rule.