premise: There have been four head coaches of the Houston Texans, a professional American football team based in Houston, Texas, United States. The Texans play in the South Division of the American Football Conference (AFC) in the National Football League (NFL).
hypothesis: The Houston Texans have had less than sixty head coaches.
reason: They've only had four, which is much less than sixty. It's difficult perhaps because the numbers are so far apart it somehow confuses the system.