Yes this is exactly what I want. I have rna sequences that have been aligned to dna so each rna has associated with it a number of dna but other rna sequences may also align to some of these dna sequences. The original keys tell me what dna is aligned to each rna but i want to see, for each dna, what rna it has been aligned to.

In reply to Re^2: inverting keys in a 2-D Hash by melmoth
in thread inverting keys in a 2-D Hash by melmoth

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