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  1. or download this
    use Inline C;
    use strict;
    ...
      return sum;
    }
    
  2. or download this
    IN: (9:abcdefabc) (12:xyzabcabc@@@)
    '@' ( 64) x    -3
    ...
    'y' (121) x    -1
    'z' (122) x    -1
    OUT: 9
    
  3. or download this
    ...
    __END__
    ...
    
      return sum;
    }