What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_7, if x_7 were a janitor, then x_7 is an astronaut. For all x_7, x_7 is a janitor or x_7 is not an astronaut. There is at least one x_7 for which x_7 is a janitor.
There is at least one x_7 for which x_7 is an astronaut. For all x_7, if x_7 were an astronaut, then x_7 is a janitor.