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  1. or download this
    my %hash = (doc1 => 2345, doc2 => 1234, 
            doc3 => 5678, doc4 => 4567);
  2. or download this
    my @keys = sort {$hash{$a} <=> $hash{$b} }(keys %hash);
  3. or download this
     my @array = (["doc1", 2345], ["doc2", 1234], 
              ["doc3", 5678], ["doc4", 4567]);