It still doesn't sound very clear...

Guesswork on my part, but perhaps Algorithm::Cluster, based on Michiel de Hoon's cluster program is useful?

A commandline --help page is here; and the paper.

If all else fails there is a clustering bibliography as well.

In reply to Re^3: Find similar records based on multiple column with multiple criteria by erix
in thread Find similar records based on multiple column with multiple criteria by ssc37

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