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  1. or download this
          my $copy1b = '0' . $copy1;
          my $copy2b = $copy2 . $_;
          
          $n = ($copy1b | $copy2b);
    
  2. or download this
      DB<38> say (0 . "$_" | 1 . "1") for qw/0 2 4 6 8/ 
    11
    ...
    15
    15
    11
    
  3. or download this
      DB<39> use feature 'bitwise'; say (0 . "$_" |. 1 . "1") for qw/0 2 4
    + 6 8/ 
    11
    ...
    15
    17
    19