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: p_11 -> r. p_11 <-> r. w_2 <-> p_11. ~r.
~p_11 can be inferred via the modus tollens rule. p_11 -> r can be inferred via the biconditional elimination rule. w_2 -> p_11 can be inferred via the biconditional elimination rule. r -> p_11 can be inferred via the biconditional elimination rule. p_11 -> w_2 can be inferred via the biconditional elimination rule. ~p_11 can be inferred via the biconditional elimination rule.