What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_5, x_5 is a scientist or x_5 is not a sailor. For all x_5, if x_5 takes a plane, then x_5 is a sailor. There is at least one x_5 for which if x_5 were a janitor, then x_5 is taking a plane.
There is at least one x_5 for which if x_5 were a janitor, then x_5 is a sailor. For all x_5, if x_5 were a sailor, then x_5 is a scientist.