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  1. or download this
    
[0] ->  1 4 6 8 9 ...
...
[5] ->  4 5 7 8 9 ...
[6] ->  1 4 5 7 8 ...
...
  2. or download this
    1. 5 -> is shared between all four arrays ([1],[2], [5], [6])
2. 4  -> is shared between 3 arrays ([2],[5], [6])
  3. or download this
    for (1,2,5,6){
   foreach $ar (@{$D[$_]}){
...
# sort %hash
#pick top two