>
<span class="r-out co"><span class="r-pr">#&gt;</span> 7   o  o  o  o</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 8   o  o  o  o</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 9   o  o  o  o</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 10  o  o  o  o</span>
<span class="r-in"><span><span class="fu">zipFastener</span><span class="op">(</span><span class="va">df2</span>, <span class="va">df1</span>, <span class="fl">1</span><span class="op">)</span></span></