1. The rules and hand signs of the referees in the NFL.
http://static.nfl.com/static/content/public/image/rulebook/pdfs/23_2012_Official_Signals.pdf
2. The different types of roommates.
http://www.usatodayeducate.com/staging/index.php/blog/hall-of-shame-10-worst-types-of-college-roommates
3. The planets of are solar system with the asteroid belt, sun, and Pluto.
http://www.space.com/56-our-solar-system-facts-formation-and-discovery.html
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