I always draw a line or x or something below the last player, write the number of players, and initial if the number on players matches the book. This lets us know where the last player is, and the number that should be out there. In this situation I was assuming the false #4 was in the book as a different number. In this case we probably won't catch it in pregame. If the teams take off their warm-ups I always glance through to make sure there are no dups, but they don't always do that.
I always hate to compare sports, but we take care of this real quick in volleyball. During pregame you take the roster, walk onto the floor, and x off everyone. That way you get an accurate count, and you know there are no dup numbers. It takes 5 minutes, and all is good.
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