dest.fl: include copyFields that have one of these as a destination</li>
   <li>source.fl: include copyFields that have one of these as a source</li>
 </ul>

 If both dest.fl and source.fl are given as query parameters, the copyfields
 in the response will be restricted to those that match any of the destinations
 in dest.fl and also match any of the sources in source.fl.</div>
</li>
</ul>
</div>
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