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: u_2 -> u. r -> q_16. ~s. u_2. s <-> q_16.
u can be inferred via the modus ponens rule. ~s and u_2 can be inferred via the conjunction rule. u_2 and ~s can be inferred via the conjunction rule. s -> q_16 can be inferred via the biconditional elimination rule. q_16 -> s can be inferred via the biconditional elimination rule. ~q_16 can be inferred via the biconditional elimination rule.