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: w_3 <-> q_12. w. ~r_3. r_3 <-> q_12.
w and ~r_3 can be inferred via the conjunction rule. ~r_3 and w can be inferred via the conjunction rule. w_3 -> q_12 can be inferred via the biconditional elimination rule. r_3 -> q_12 can be inferred via the biconditional elimination rule. q_12 -> w_3 can be inferred via the biconditional elimination rule. q_12 -> r_3 can be inferred via the biconditional elimination rule. ~q_12 can be inferred via the biconditional elimination rule.