swap(&arr[low], &arr[j]);
Prior to the organ transplant list, donation relied entirely on people carrying organ donor cards.
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（四）私分、侵占、挪用、故意损毁所收缴、追缴、扣押的财物的；
A simpler API would mean fewer concepts, fewer interactions between concepts, and fewer edge cases to get right resulting in more confidence that implementations actually behave consistently.