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A problem that may be complete for a category C is alleged to get C-complete, and The category of all problems complete for C is denoted C-complete.知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。: a forward spin specified into a ball (as in golfing or billiards) by placing it on or close to the