--</span>
<span class="comment">// in interval [1,4) intervals do not overlap</span>
<span class="comment">// in interval [4,6): 2 intervals overlap</span>
<span class="comment">// in interval [6,8): 3 intervals overlap</span>
<span class="comment">// in interval [8,9): 2 intervals overlap</span>
<span class="comment">// -----------------------------------------------------------</span>
</pre>
<p>
      </p>
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