A throws the ball to B, who immediately passes to C. Then A and
B change place. C passes to D who passes to A. Then C and D
change place.
Greater speed can be applied if the ball lane
is between A and D all the time. A passes to D and immediately change
place with B. D passes to B on A's position and D now change place
with C. Then the exercise starts all over again.
We call it: ____________________________________
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