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  1. or download this
    A => A 6.8888
B => B  6.8888
C => C 6.8888
D => D 6.8888
  2. or download this
    my @letters=qw(A B C D);
print '    ';
...
    }
}
  3. or download this
    
      A      B      C      D
...
B    0.1    6.8    0.1    0.1    
C    0.1    0.1    6.8    0.1
D    0.1    0.1    0.1    6.8