 pointing to start of first set </p></td>
</tr>
<tr>
<td><p><span class="term"><code class="computeroutput">first2</code></span></p></td>
<td><p>Iterator pointing to start of second set </p></td>
</tr>
<tr>
<td><p><span class="term"><code class="computeroutput">last1</code></span></p></td>
<td><p>Iterator pointing to end of first set </p></td>
</tr>
<tr>
<td><p><span class="term"><code class="computeroutput">last2</code></span></p></td>
<td><p>Iterator pointing to end of second set </p></td>
</tr>
<tr>
<td>