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How is hockey won?

 The aim of a hockey game is to get the puck -- a 3-inch (7.6-centimeter) diameter rubber disc -- completely across the goal line into the net. Players cannot purposely kick or hit the puck in with their hands or with a stick above the net, although almost any other way of getting the puck in there counts as a goal. Penalty shots at goal are given in certain circumstances. The team with the most goals at the end of the game wins.