What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z, z will play tennis if and only if z will sleep. For all z, z will play tennis. There is at least one z for which if z drinks water, then z is not sleeping.
For all z, if z plays tennis, then z is sleeping. For all z, if z sleeps, then z is playing tennis.