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_14. q_14 or ~q_7. u -> u_1.
q_7 -> q_14 can be inferred via the rewriting rule. u -> q_14 can be inferred via the biconditional elimination rule. q_14 -> u can be inferred via the biconditional elimination rule.