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  1. or download this
    $ perl -e 'my $m = 20; print $m++ + $m++, "\n"'
    41
    ...
    
    $ perl -e 'my $m = 20; print ++$m + ++$m, "\n"'
    44
    
  2. or download this
    s**lil*;  $*=join'',sort split q**;  s;.*;grr; &&s+(.(.)).+$2$1+; $; =
    qq-$_-;s,.*,ahc,;$,.=chop for split q,,,reverse;print for($,,$;,$*,$/)