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My "GUESS" is that they are tracking the movements of the Libero for each team. Volleyball limits the number of substituions. The Libero can go in/out as often as they like and without notifying the official as long as the player they come in for comes back in for them. The Libero plays in the back row....as a defensive specialist. It can get pretty confusing so someone has to track the ins/outs and for who.
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