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 -> p. w_2 or ~w. p -> p_11. p <-> w_2. ~p_11.
~p can be inferred via the modus tollens rule. w -> w_2 can be inferred via the rewriting rule. p_11 <-> p can be inferred via the biconditional introduction rule. p <-> p_11 can be inferred via the biconditional introduction rule. p -> w_2 can be inferred via the biconditional elimination rule. w_2 -> p can be inferred via the biconditional elimination rule.