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Coincides with IMFB articles like:
https://ironmanfootballblog.com/2016/12/26/the-imfb-4-2-5-defense-introduction/
https://ironmanfootballblog.com/2016/08/28/install-5-linebacker-drills-video-and-manual/
https://ironmanfootballblog.com/2016/08/01/imfb-teaching-tackling/
