ss="op">(</span><span class="va">dfm</span><span class="op">)</span></span>
<span><span class="co">#&gt; # A tibble: 7 × 2</span></span>
<span><span class="co">#&gt;   x1    x2</span></span>
<span><span class="co">#&gt;   &lt;chr&gt; &lt;dbl+lbl&gt;</span></span>
<span><span class="co">#&gt; 1 a       1</span></span>
<span><span class="co">#&gt; 2 b       2</span></span>
<span><span class="co">#&gt; 3 c       3</span></span>
<span><span class="co">#&gt; 4 d       4</span></span>
<span><span class="co">#&gt