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  1. !! +exec+ +var+ +string+
  2. $lst_tit embraced$lst_titend$type_both
  3.   $(lst_syntax)embraced $emph opword string$emphend</tt>
  4.   $lst_mean executes an operation $emph opword$emphend in each
  5.   substring of $emph string$emphend enclosed in a pair of curly braces.
  6.   <p>
  7.   The curly braces in $emph string$emphend can be nested, but
  8.   the execution runs from outmost pair to innermost pair.
  9.   </p><p>
  10.   Available $emph opword$emphend:
  11.   </p><ul>
  12.   <li><tt>randitem</tt>. Random item in every embraced text.</li>
  13.   <li><tt>extract</tt>. Extracts the first (outmost) embraced text.</li>
  14.   <li><tt>delete</tt>. Deletes all embraced contents (encluding the
  15.   curly braces).</li>
  16.   </ul>
  17.  
  18.