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15 for '15: College football's best rivalries

» Complete 15 for '15 series

One of the special things about college football is how important -- and sometimes personal -- annual rivalry games become for fans. It's not only one team against the other -- it's decades of history wrapped up into a single game every year. While it was difficult to narrow the list down, CFB 24/7's "15 for '15" series continues with a look at the sport's greatest rivalries.