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Whatever cell the Pac-Man character occupied had maximum Pac-Man smell, and the most recently vacated cell had maximum Pac-Man smell minus 1, and the smell decayed rapidly.
Pac - Man角色占用的格子有最大的Pac - man气味，而最近腾出来的格子的气味值为最大气味减去1，并且气味迅速衰退。
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