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1 4 round apple,ball,orange,pumpkin
2 2 red,round apple,ball
...
4 1 fruit,orange,plant,round orange
4 1 fruit,plant,red,round apple
4 1 orange,plant,round,vetetable pumpkin

my $item2attr = {
            apple   => {red=>1,   round=>1,plant=>1,fruit=>1},
...
  }
  return sort @shared_items;
}