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 or ~q_10. u <-> q_10.
q_10 -> u can be inferred via the rewriting rule. u -> q_10 can be inferred via the biconditional elimination rule. q_10 -> u can be inferred via the biconditional elimination rule.