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_3 -> q_6. w_3. q_6 <-> w.
q_6 can be inferred via the modus ponens rule. q_6 -> w can be inferred via the biconditional elimination rule. w -> q_6 can be inferred via the biconditional elimination rule.