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_1 <-> q_3. q_3 or ~w_1. u -> q_3. ~w_1.
w_1 -> q_3 can be inferred via the rewriting rule. w_1 -> q_3 can be inferred via the biconditional elimination rule. q_3 -> w_1 can be inferred via the biconditional elimination rule. ~q_3 can be inferred via the biconditional elimination rule.