Now that I think about, I guess I kinda gave a bad example. For the values that might be duplicated, they would be integers which "should" be added together and then stored into the hash. So I guess there wouldn't be a value that has more than one value for particular record.
With this new info do you still think it's necessary to do a hash of hashes still?
Re^2: Assign 2D-Arrays to a hash using a key
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It may not be necessary, if your data is reliable enough that you know there will always be the same number of values in the same order for each key. But I still like the hash-of-hashes because it tends to be easier to remember key names than index numbers. For instance, which of these makes it easier to recognize what it contains?