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_13 -> w_3. q_13 -> w_3. q_13 -> ~q_2. w_3 -> q_13. q_2.
~q_13 can be inferred via the modus tollens rule. w_3 -> ~q_2 can be inferred via the transitivity rule. q_13 <-> w_3 can be inferred via the biconditional introduction rule. q_13 <-> w_3 can be inferred via the biconditional introduction rule. w_3 <-> q_13 can be inferred via the biconditional introduction rule. w_3 <-> q_13 can be inferred via the biconditional introduction rule.