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_3 or s. s <-> q_12. q_3 -> q_12. q_12 -> q.
q_3 -> q can be inferred via the transitivity rule. s -> q_12 can be inferred via the biconditional elimination rule. q_12 -> s can be inferred via the biconditional elimination rule.