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There is no sport more green than college football. Not because of Tulane's Green Wave, North Texas' Mean Green or Notre Dame's special jerseys. Football is green in the word's newest definition. Football recycles. Offenses appear to evolve. In fact, they revolve, same as doors and wheels. What goes around comes around. Today's spread option looks a lot like yesterday's single wing. Here is a look at eight offenses that span the past century, how they work and whether they are in or out of fashion -- for now. -- Ivan Maisel