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_4 <-> q. p_1 -> w_4. ~q.
w_4 -> q can be inferred via the biconditional elimination rule. q -> w_4 can be inferred via the biconditional elimination rule. ~w_4 can be inferred via the biconditional elimination rule.