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by a1369209993
4223 days ago
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The middle column is changing by at most one number. Furthermore, it's changing by at most one number always in the same direction, a feature not shared by the right column. (The direction thing doesn't matter for binary grey codes, since 1 + 1 = 1 - 1 = 0 and 0 + 1 = 0 - 1 = 1.) |
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