清单2演示了这种技术，该代码是用于匹配在线游戏服务中的玩家的一种机制。

Listing 2, a mechanism for matching players in an online game service, illustrates this technique.

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注意，玩家不可以使任何牌“离职”同对手的未匹配牌结合。

Note that a player is not permitted to lay off any CARDS on the unmatched CARDS in the opponent's hand.

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玩家不是刮开橡胶层就发现结果，而是花时间将刮出的数字和牌上的数字进行匹配。

Instead of just scratching off the latex and immediately discovering a loser, players have to spend time matching up the revealed Numbers with the boards.

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