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 -> q_11. q_11 or ~w. q_11 -> q.
w -> q_11 can be inferred via the rewriting rule. q <-> q_11 can be inferred via the biconditional introduction rule. q_11 <-> q can be inferred via the biconditional introduction rule.