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. p_2 <-> s. s or ~p_2. ~s.
~p_2 can be inferred via the disjunctive syllogism rule. q and ~s can be inferred via the conjunction rule. ~s and q can be inferred via the conjunction rule. p_2 -> s can be inferred via the rewriting rule. p_2 -> s can be inferred via the biconditional elimination rule. s -> p_2 can be inferred via the biconditional elimination rule. ~p_2 can be inferred via the biconditional elimination rule.