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在自然界常存在匹配规则,即某些事物是互相一一匹配。当A—B进行匹配以后,便不能与第三者进行匹配。这种现象可以用数学上图论来表示。
Matching rules exist in nature, that is, some things match one another. When A-B is matched, it can not be matched with a third party. This phenomenon can be represented mathematically by graph theory.