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  1. or download this
    sub no_reference {
        $_[0] =~ s/o/O/g;
    ...
    $string = 'Bozo is a clown';
    no_reference($string);
    print $string, "\n";
    
  2. or download this
    ($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
    }map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,