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_2 -> p. p_2 or ~p. p_2 <-> q_11.
p -> p_2 can be inferred via the rewriting rule. p_2 -> q_11 can be inferred via the biconditional elimination rule. q_11 -> p_2 can be inferred via the biconditional elimination rule.