Three police officers on motorcycles on the street with pedestrians walking on the sidewalk in the background .
The three policemen are riding horses .
Three police officers on motorcycles on the street with pedestrians walking on the sidewalk in the background.
The three policemen are riding horses.
The three police officers cannot be both on their motorcycles and riding horses at the same time.
The three police officers can not be both on their motorcycles and riding horses at the same time .