s="n">nodes</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="s">&quot;A&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;B&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;C&quot;</span><span class="p">};</span>

<span class="w">  </span><span class="c1">// the pipeline consists of three serial pipes</span>
<span class="w">  </span><span class="c1">// and up to two concurrent s