ary/Frameworks/R.framework/Versions/3.5/Re…     2 filter   &lt;list […</span></a>
<a class="sourceLine" id="cb10-10" data-line-number="10"><span class="co">#&gt;  4 /Library/Frameworks/R.framework/Versions/3.5/Re…     2 is.na    &lt;list […</span></a>
<a class="sourceLine" id="cb10-11" data-line-number="11"><span class="co">#&gt;  5 /Library/Frameworks/R.framework/Versions/3.5/Re…     2 is.na    &lt;list […</span></a>
<a class="sourceLine" id="cb10-12" data-line-number="12"><span class="co">#&gt