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      <p class="shortcomment cmt">Implementation of an Ordering for O
</p>
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      <a id="tag:org.saddle.ST[O]"></a>
      <a id="tag:ST[O]"></a>
      <h4 class="signature">
      <span class="modifier_kind">
        <span class="modifier">abstract </span>
        <span class="kind">def</span>
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      <span class="symbol">
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