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Posted by ESPN.com's Adam Rittenberg
Big Ten media days are in the books, and the start of preseason camp is just around the corner. Who will win quarterback competitions at Michigan, Wisconsin and Michigan State? Can teams replace standouts like Chris "Beanie" Wells, Shonn Greene, Javon Ringer, Aaron Maybin and James Laurinaitis? How will Minnesota, Purdue, Michigan and Illinois adjust to new coordinators? Get out your calendars and mark down these dates as teams return to the practice field.