What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z, if z were sad, then z is a sailor. There is at least one z for which if z plays tennis, then z is driving a car. For all z, if z were a sailor, then z is driving a car. For all z, z will play tennis or z is sad.
For all z, if z were sad, then z is driving a car.