premise1: Two men are riding horses, one horse is brown and one is black.
premise2: Two men ride horses while wielding whips.
premise3: Man riding an unbroken horse or bronco.
premise4: Two men riding horses at an event
premise: Two men are riding horses, one horse is brown and one is black. Two men ride horses while wielding whips. Man riding an unbroken horse or bronco. Two men riding horses at an event
hypothesis: A man trying to stay on a horse.