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, if x_5 were a nurse, then x_5 is a doctor. For all x_5, x_5 is not a doctor. For all x_5, x_5 is a taxi driver if and only if x_5 will play tennis. For all x_5, x_5 will play tennis if and only if x_5 is a nurse.
For all x_5, x_5 is not a nurse. For all x_5, if x_5 were a taxi driver, then x_5 is playing tennis. For all x_5, if x_5 plays tennis, then x_5 is a nurse. For all x_5, if x_5 plays tennis, then x_5 is a taxi driver. For all x_5, if x_5 were a nurse, then x_5 is playing tennis.