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  1. or download this
    c:\@Work\Perl\monks>perl -wMstrict -le
    "my $s = '&  <  >  <  >  &<  &&
    +';
    ...
    "
    '&  <  >  <  >  &<  &&'
    '&  &lt;  &gt;  <  >  &<  &&'
    
  2. or download this
    c:\@Work\Perl\monks>perl -wMstrict -le
    "my $s = '&amp;  &amp;lt;  &amp;gt;  &lt;  &gt;  &amp;&lt;  &amp;&amp;
    +';
    ...
    '&amp;  &amp;lt;  &amp;gt;  &lt;  &gt;  &amp;&lt;  &amp;&amp;'
    (?^msx: lt | gt | amp )
    '&  &lt;  &gt;  <  >  &<  &&'