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: t_2 -> ~t. q -> q_1. t. q.
q_1 can be inferred via the modus ponens rule. ~t_2 can be inferred via the modus tollens rule. t and q can be inferred via the conjunction rule. q and t can be inferred via the conjunction rule.