Premise: Volleyball . Each team tries to score points by grounding a ball on the other team 's court under organized rules . But simply , play proceeds as follows : a player on one of the teams begins a ` rally ' by serving the ball ( tossing or releasing it and then hitting it with a hand or arm ) , from behind the back boundary line of the court , over the net , and into the receiving team 's court .
Hypothesis: Volleyball is a solo sport.
Label: CONTRADICTION