Also known as reflected binary code, reflected binary, RB, RBC
ordering of binary strings such that subsequent strings differ only in one bit
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格雷码（循环二进制单位距离碼）是任意两个相邻数的代码只有一位二进制数不同的编码，它与奇偶校验码同属。
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).