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                    <section class="section">
                      <div class="pointer"></div>
                      <div class="abstract">
                        <p>Helper that for check if you have this View controller instance, it&rsquo;s intended to use for you check if that instance already was instantiated or not, if you never called this instance will return nil.</p>
<h3 id='usage-example' class='heading'>Usage Example:</h3>
<pre class="highlight swift"><code>   <span class="kt">ContainerFlowStac