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Amidakuji 劃鬼腳 , amida (某電子遊戲名).
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Amidakuji (阿弥陀籤) is a Japanese method of lottery designed to create random pairings between two sets of any number of things, as long as the number of elements in each set is the same. This is often used to distribute things among people, where the number of things distributed is the same as the number of people. For instance, chores or prizes could be assigned fairly and randomly this way.
As an example, consider assigning roles in a play to actors.
To start with, the two sets are enumerated horizontally across a board. The actors' names would go on top, and the roles on the bottom. Then, vertical lines are drawn connecting each actor with the role directly below it.The names of the actors and/or roles are then concealed so that people do not know which actor is on which line, or which role is on which line.Next, each actor adds a horizontal line to the board. Each line must connect two adjacent vertical lines, and must not directly touch any other horizontal line.Once this is done, the vertical lines are traced from top to bottom. As you follow the line down, if you come across a horizontal line, you follow it to the adjacent vertical line on the left or right, then resume tracing down. You continue until you reach the bottom of a vertical line, and the top item you started from is now paired with the bottom item you ended on. Another process involves creating the ladder beforehand, then concealing it. Then people take turns choosing a path to start from at the top. If no part of the amidakuji is concealed, then it is possible to fix the system so that you are guaranteed to get a certain pairing, thus defeating the idea of random chance.
http://en.wikipedia.org/wiki/Amidakuji