What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y, y is a politician or y will not take a plane. For all y, if y were a politician, then y is playing tennis. There is at least one y for which if y were an office clerk, then y is driving a car. For all y, if y plays tennis, then y is an office clerk.
For all y, if y were a politician, then y is an office clerk. There is at least one y for which if y plays tennis, then y is driving a car. For all y, if y takes a plane, then y is a politician.