You may find the answers to combine duplicate entries helpful as a starting point. During building the hash take note of the number of elements in the largest array. Then iterate from 1 to number of elements. In each iteration use grep to pull out a list of the arrays containing the data for the file matching that number of elements.

DWIM is Perl's answer to Gödel

In reply to Re: select only duplicate entries by GrandFather
in thread select only duplicate entries by Anonymous Monk

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