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21 personnel means that there are two running backs, one tight end, and two wide receivers.
13 personnel means that there is one running back, three tight ends, and one receiver.
22 personnel means that there are two running backs, two tight ends, and one receiver on the field.
12 personnel means that there is one running back, two tight ends, and two receivers on the field.
11 personnel means that there is one running back, one tight end, and three receivers on the field.
10 personnel means that there is one running back and four receivers on the field and is common in Air Raid and Spread offenses.
00 personnel means that there are five receivers on the field. As a result, there are zero running backs or tight ends.