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. w <-> q_13.
w -> q_13 can be inferred via the biconditional elimination rule. q_13 -> w can be inferred via the biconditional elimination rule. ~q_13 can be inferred via the biconditional elimination rule.