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_11. p_4 -> q. p_4 or ~q. q <-> q_11.
q -> p_4 can be inferred via the rewriting rule. q -> q_11 can be inferred via the biconditional elimination rule. q_11 -> q can be inferred via the biconditional elimination rule. ~q can be inferred via the biconditional elimination rule.