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 -> p_11. p_11 -> p. p_11 or ~p.
p -> p_11 can be inferred via the rewriting rule. p <-> p_11 can be inferred via the biconditional introduction rule. p_11 <-> p can be inferred via the biconditional introduction rule.