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_3 <-> u. ~s_2. ~u. s_2 or q_13. w -> q_3.
q_13 can be inferred via the disjunctive syllogism rule. ~s_2 and ~u can be inferred via the conjunction rule. ~u and ~s_2 can be inferred via the conjunction rule. q_3 -> u can be inferred via the biconditional elimination rule. u -> q_3 can be inferred via the biconditional elimination rule. ~q_3 can be inferred via the biconditional elimination rule.