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How many angels can dance on the head of a pin? Usually, a series of football plays requires play begins with a "Scrimmage Down formation". Without a minimal formation requirement definition, there would be chaos.
This "revision" seems a, basically immaterial, attempt to pacify those whining for a, somewhat, meaningless semantics change, that should clarify the retention of a requirement for 5 players numbered between 50-79 and no more than 4 players, satisfying the requirements of being a "back".(both of which that have clearly existed, and was universally understood, for decades)
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