What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_16, x_16 is a janitor if and only if x_16 will drive a car. For all x_16, x_16 will play squash if and only if x_16 is a janitor. There is at least one x_16 for which x_16 will not drive a car. For all x_16, x_16 will play squash or x_16 will listen to a song.
For all x_16, if x_16 were a janitor, then x_16 is driving a car. For all x_16, if x_16 plays squash, then x_16 is a janitor. For all x_16, if x_16 drives a car, then x_16 is a janitor. For all x_16, if x_16 were a janitor, then x_16 is playing squash. There is at least one x_16 for which x_16 is not a janitor.