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, x_4 will sleep or x_4 is not a janitor. For all x_4, x_4 will sleep or x_4 will not work. There is at least one x_4 for which x_4 will work or x_4 is a janitor.
For all x_4, if x_4 were a janitor, then x_4 is sleeping. For all x_4, if x_4 works, then x_4 is sleeping.