This post provides some nice python code to find all the permutations in a set that sum up to some number S. I would like to eliminate the discontinuities in the output so that no one element in a row of output differs by more than 1 from any adjacent row. provides some nice python code to fin
阅读背景：
如何排序排列，使每个排列中的至少一个元素恰好相差1
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