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_1. p_1 -> q. p_11 -> u. ~u.
q can be inferred via the modus ponens rule. ~p_11 can be inferred via the modus tollens rule. p_1 and ~u can be inferred via the conjunction rule. ~u and p_1 can be inferred via the conjunction rule.