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      <span class="phrase"><a name="sort.definitions.stable_sort"></a></span><a class="link" href="definitions.html#sort.definitions.stable_sort">stable
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<p>
      A sorting approach that preserves pre-existing order. If there are two elements
      with identical keys in a list that is later stably sorted, whichever came first
      in the initial list will come first in a stably sorted list. The algorithms
      provided here provide no such guarantee; items with identical keys will have
      arbitrary resulting order relative to each other.
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