What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_4, if x_4 were fast, then x_4 is a janitor. For all x_4, if x_4 were poor, then x_4 is fast. For all x_4, x_4 will drive a car or x_4 is poor. For all x_4, if x_4 drives a car, then x_4 is fast.
For all x_4, if x_4 were poor, then x_4 is a janitor. For all x_4, if x_4 drives a car, then x_4 is a janitor. For all x_4, x_4 is fast.