&lt;int&gt;     &lt;int&gt;    &lt;num&gt;     &lt;Date&gt;     &lt;Date&gt;</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 1:        1         885        887       889        5 1984-06-03 1984-06-05</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 2:        2         899        901       904        6 1984-06-17 1984-06-19</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 3:        3         908        922       926       19 1984-06-26 1984-07-10</span>
<span class="r