Hello Monks, Below is from perlfaq4: Question is the thing used in push is array of hashes or hash of array? How do we recognize such structure? Is there any thumb rule? 
while (($key, $value) = each %by_key) {
   push @{$key_list_by_value{$value}}, $key;
}

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Thanks in advance.

In reply to Array of Hashes or Hash of Arrays by perl@1983

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