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 or s. q or q_7. q_7 <-> u. ~u.
q_7 or s can be inferred via the resolution rule. q_7 -> u can be inferred via the biconditional elimination rule. u -> q_7 can be inferred via the biconditional elimination rule. ~q_7 can be inferred via the biconditional elimination rule.