A number of people in white cowboy hats are sitting on horses and talking , while a man in a black cowboy hat sits on a nearby fence .
It is impossible that many people are on horses while one man is not because he does n't know how to ride one .
It is impossible that many people are on horses while one man is not because he does n't know how to ride one .
There is a very good chance that many people are on horses while one man is not because he does n't know how to ride one .
Many people are on horses while one man is not because he does n't know how to ride one .