Hi roboticus: Thanks for your reply.

That posting mentions that it might not work for # mismatches > 1

If that statement is indeed true, then it wont help with case c. listed in my OP. Do you care to comment please? Does BrowserUK's incomplete solution, based on your OP there, seem like a viable option for further modification?

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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