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. r_2 and q. p <-> q_2.
r_2 can be inferred via the simplification rule. q can be inferred via the simplification rule. p -> q_2 can be inferred via the biconditional elimination rule. q_2 -> p can be inferred via the biconditional elimination rule. ~q_2 can be inferred via the biconditional elimination rule.