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: q_2. p_1 -> p. p -> p_1. p_1 -> ~q_2.
~p_1 can be inferred via the modus tollens rule. p -> ~q_2 can be inferred via the transitivity rule. p_1 <-> p can be inferred via the biconditional introduction rule. p <-> p_1 can be inferred via the biconditional introduction rule.