If you think that a question deserves a useless answer, then why bother answering?
Furthermore we were given exact input and an exact desired result. What additional detail could have made the question any clearer?
My attitude is that unless I am willing to provide an answer that I believe will be helpful, I won't answer. When the question indicates to me that the questioner may not know much Perl at all, my definition of a useful answer becomes very detailed. A higher level summary is OK when I think the questioner will understand it.
And a final note. Your answer had a severe error. You cannot possibly do exactly what the questioner requested using symbolic references. I'll leave it as an exercise for you to test and/or read documentation to discover why.
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