">X</span></tt> being Copy Constructible, the following
expressions are valid and respect the stated semantics.</p>
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<tr><th class="head" colspan="3">Swappable Iterator Requirements (in addition to Copy Constructible)</th>
</tr>
<tr><th class="head">Expression</th>
<th class="head">Return Type</th>
<th class="head">Postcondition</th>
</tr>
</thead>
<tbody valign="top"