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So each team can have the opportunity to play on each net on the rink. Also it is used for the fans inside the stadium so no matter what side of the arena you sit on you can see the home team shoot at your side of the arena at least once a game. Also neither team can say the sabotaged one side in favor for one of the teams. Mostly to make it fair for both teams

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Q: Why do hockey teams change sides after each period?
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