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: p_6 -> q_6. p_2 <-> q. p_6. p_2 -> ~q_6.
q_6 can be inferred via the modus ponens rule. p_2 -> q can be inferred via the biconditional elimination rule. q -> p_2 can be inferred via the biconditional elimination rule.