What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one x_4 for which x_4 is an astronaut or x_4 is a janitor. For all x_4, if x_4 were a janitor, then x_4 is cooking. For all x_4, x_4 is not an astronaut.
There is at least one x_4 for which x_4 is a janitor.