"></a><span class="lineno">    3</span>&#160;<span class="preprocessor">#include &lt;stack&gt;</span></div><div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;</div><div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="preprocessor">#include &quot;flow_builder.hpp&quot;</span></div><div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="preprocessor">#include &quot;topology.hpp&quot;</span></div><div class="lin