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: r_2 or q_2. p or ~q_2. p <-> r_2.
q_2 -> p can be inferred via the rewriting rule. p -> r_2 can be inferred via the biconditional elimination rule. r_2 -> p can be inferred via the biconditional elimination rule.