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_8 <-> q_3. w <-> q_8.
q_8 -> q_3 can be inferred via the biconditional elimination rule. w -> q_8 can be inferred via the biconditional elimination rule. q_3 -> q_8 can be inferred via the biconditional elimination rule. q_8 -> w can be inferred via the biconditional elimination rule.