ine"><a name="l00056"></a><span class="lineno">   56</span>&#160;    <span class="comment">// Mutex because we are changing the dynamically allocated graphKeys</span></div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;    std::lock_guard&lt;std::mutex&gt; modifyGraphKeysLock(gtsamDynamicExpressionKeys.get&lt;gtsam::Pose3&gt;().mutex());</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160; </div>
<div class="line"><a name="l00059"></a><span cla