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  1. or download this
    Syntax based folding can be enabled by adding the following lines to t
+he file
'~/.vim/syntax/perl.vim':                 
 
  let perl_fold=1
  let perl_fold_blocks=1
  2. or download this
    s**lil*;  $*=join'',sort split q**;  s;.*;grr; &&s+(.(.)).+$2$1+; $; =
qq-$_-;s,.*,ahc,;$,.=chop for split q,,,reverse;print for($,,$;,$*,$/)