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Alex Mack, former Falcons center, retiring after 13 NFL seasons
Alex Mack announces NFL retirement
Former Falcons center Alex Mack announces retirement
Former Browns Center Alex Mack Announces Retirement from NFL
Center Alex Mack announces retirement after 13 NFL seasons - ESPN
Alex Mack retires: Seven-time Pro Bowl center ends career after 13 seasons with Browns, Falcons and 49ers
49ers' Alex Mack announces retirement
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