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Those seem to be for the location so that the team on the field can look for play calls. It has nothing to do with the officials at all. It is something Michigan does with the type of offense they run. They run audibles from the sideline and that appears to be where the team looks to get their signals.
Peace
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Let us get into "Good Trouble."
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Charles Michael “Mick” Chambers (1947-2010)
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