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_1 -> t_2. q_19. u_1.
t_2 can be inferred via the modus ponens rule. q_19 and u_1 can be inferred via the conjunction rule. u_1 and q_19 can be inferred via the conjunction rule.