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!! +exec+ +var+ +string+
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$lst_tit embraced$lst_titend$type_both<br>
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  $(lst_syntax)embraced $emph opword string$emphend</tt> <br>
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  $lst_mean executes an operation $emph opword$emphend in each
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  substring of $emph string$emphend enclosed in a pair of curly braces.
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  <p>
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  The curly braces in $emph string$emphend can be nested, but
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  the execution runs from outmost pair to innermost pair.
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  <p>
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  Available $emph opword$emphend: <ul>
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  <p><li><tt>randitem</tt>. Random item in every embraced text.
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  <p><li><tt>extract</tt>. Extracts the first (outmost) embraced text.
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  <p><li><tt>delete</tt>. Deletes all embraced contents (encluding the
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  curly braces).
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  </ul>
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