Concept explainers
In the traditional Japanese children’s game janken (or “rock, scissors, paper”), at a given signal, each of two players shows either no fingers (rock), two fingers (scissors), or all five (paper). Rock beats scissors, scissors beats paper, and paper beats rock. In the case of a tie, there is no payoff. In the case of a win, the winner collects 5 yen. (On December 10, 2004, Fox Sports broadcast the 2004 Rock Paper Scissors World Championships. See www.worldrps.com.)
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