Not_a_number, thank you for your response. Please see updated info in response to Anonymous_Monk's request for case examples. I hope the examples make it clearer. The "Text-Levenshtein" solution seems like it might work

In reply to Re^2: Filtering matches of near-perfect-matched DNA sequence pairs by onlyIDleft
in thread Filtering matches of near-perfect-matched DNA sequence pairs by onlyIDleft

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