Thank you all very much for the quick responses, all of them really helpful and instructive. So far I have tried JavaFan's and Nkuvu's solutions, and they work just fine. (I will need some time to understand exactly how they work though, might come back here if I fail to do so...). Thanks also for the pointers to Data::Dumper and the explanation as to why I was getting that error.

In reply to Re^2: Find duplicate values in hash by moff
in thread Find duplicate values in hash by moff

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