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I noticed a team doing this
Everytime a sub entered the game they were given a rolled up towel by the asst. coach and gave it to the player who was to come out of the game, and when they got back to the bench they gave the towel back to the asst. coach. I assume this was their way of making sure they knew the player subbed for came out of the game. If they sent in 3 subs they had 3 towels etc.
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