A=甲，B=乙，C=丙，D=丁；完美映射，一一对应。除了笔画多了一点之外，没觉得用甲乙丙丁有什么缺陷。

来源: 郭大平于 2024-10-21 12:07:17 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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