nd start 8 threads - each will insert in their own submaps</span></a>
<a class="sourceLine" id="cb2-25" title="25">    <span class="co">// thread 0 will insert the keys whose hash direct them to submap0 or submap1</span></a>
<a class="sourceLine" id="cb2-26" title="26">    <span class="co">// thread 1 will insert the keys whose hash direct them to submap2 or submap3</span></a>
<a class="sourceLine" id="cb2-27" title="27">    <span class="co">// ---------------------------------------------------------------