You put your index finger and thumb together of both hands above your forehead.This will make a triangle. Then you get under the volley-ball when it comes and, with the tips of your fingers, push up. :)
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the angles that you hit the ball, how high you hit the ball, and the langth you hitt the ball. you also can find out how much force is on the ball:)
the set of every set is that set
null set or empty set, is a set with no elements.
The set contained in another set is termed as a sub-set.
A null set is a set that does not contain any elements, an empty set.