The value could be an arrayref, as you say, or it could be a hashref. Advantage of a hash ref is you don't have to check for duplicates, since duplicates aren't allowed in a hash. Personally I use hashes a lot more than arrays.

In reply to Re^4: Looping through a hash where some keys are the same by tphyahoo
in thread Looping through a hash where some keys are the same by GaijinPunch

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