古罗马有一个残酷的杀死犯人的游戏。若干个犯人站成一圈，从某一个犯人开始以某个步长数数，被数中的犯人将被杀死，剩下的人继续这个残酷的游戏，数数的起点变为被杀死的人的下一个人。只有最后一个人是幸运的。为了纪念每一个死去的犯人，犯人的编号要加入到步长中，也就是步长不是固定的，而是随着每一个犯人的死去而增加。-ancient Rome with a brutal killing prisoners of the game. Several inmates stand circle, and one from a prisoner to start a step-count, the number of prisoners would be killed. The remaining people continue this cruel game, the starting point for the count into people were killed by the next person. Only the last one was lucky. To commemorate every one of the dead prisoners, the number to join the step, the step is not fixed, but with every one of the prisoners died increase.