Thanks for your answers!

I had a vague sense that something was blocking either the level-1 assignments or level-3 assignments. Data::Dumper certainly cleared that up (I had never used this before, and this will become a favorite.)

What I'm trying to do is use a hash to do a hash to merge two sets:

Set 1: I have a text file establishing the universe of accepted values: 
abc  123
abc  456
abc  789
xyz  456

Hash:

123->abc
456->abc
456->xyz
789->abc

[download]
Set 2: A set of values pointing to the hash. There may be multiple recs pointing to a hash rec (that's OK, as I just need to know of the existence of one). There maybe hash records that no one uses. 
xxx ==> 456->abc
xxx ==> 789->abc
yyy ==> 456->abc
yyy ==> 456->abc   (a dup)
zzz ==> 123->abc

Resulting hash

123->abc->zzz
456->abc->xxx
456->abc->yyy
456->xyz
789->abc->xxx

[download]
I could just hash the second set, but I won't get the non-use ones like 456->xyz.

I've tried building the first hash and using arrays for the latter hash, but it runs rather slowly from all the repeated scans.

Suggestions appreciated.

In reply to Re^2: (another) HoH question by zuma53
in thread (another) HoH question by zuma53

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