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There is a difference between silently and visibly.
You can count silently in your head on the 3 sec. lane violation with no arm motion.
All other counts need an arm or hand motion and must be silent.
Counting out loud on a throw-in would be a big advantage to the thrower-in.
In my early years, a player asked if I could count out loud and I agreed to. I did not put the whistle in my mouth when counting and (you guessed it) I had a foul on the throw-in. By the time I got the whistle in and blew it the ball had advanced down the floor. Had to explain what happened. Never again!
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