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{
'A' => {
...

    }
}

 { 
   'B' => { 'C' => 2 ,'G' => 1}             # see G's and H's count is
+ 1  Taking G and H's pair only once.  C is 2 because C, E and C,F do 
+not make a pair, C comes twice and E and F once
   'D' => { 'E' => 1, 'H' => 1, 'F'=>1, }   # see H's count is 1
}