. When <code>length(sep_out) &gt; 1</code>, the last element of <code>sep_out</code> gets recycled and separators are incorporated per string according to their order.</p></td>
    </tr>
    <tr>
      <th>unique_sep</th>
      <td><p>A string. If not <code>NULL</code>, then duplicated names will get 
a suffix integer
in the order of their appearance. The suffix is separated by the supplied string
 to this argument.</p></td>
    </tr>
    <tr>
      <th>empty_fill</th>
      <td><p>A string. If it is suppli