Minnesota Vikings running back Adrian Peterson walks off the field after an NFL football game against the Tennessee Titans, Sunday, Oct. 7, 2012, in Minneapolis. The Vikings won 30-7. (AP Photo/Genevieve Ross)

Associated Press
Minnesota Vikings running back Adrian Peterson walks off the field after an NFL football game against the Tennessee Titans, Sunday, Oct. 7, 2012, in Minneapolis. The Vikings won 30-7. (AP Photo/Genevieve Ross)
Minnesota Vikings running back Adrian Peterson walks off the field after an NFL football game against the Tennessee Titans, Sunday, Oct. 7, 2012, in Minneapolis. The Vikings won 30-7. (AP Photo/Genevieve Ross)
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