What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_13, x_13 will read a book or x_13 is an astronaut. There is at least one x_13 for which if x_13 reads a book, then x_13 is a janitor. For all x_13, if x_13 were a bartender, then x_13 is taking a plane. For all x_13, x_13 will take a plane if and only if x_13 is a janitor. For all x_13, if x_13 were an astronaut, then x_13 is a bartender.
For all x_13, if x_13 were an astronaut, then x_13 is taking a plane. For all x_13, if x_13 takes a plane, then x_13 is a janitor. For all x_13, if x_13 were a janitor, then x_13 is taking a plane.