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Have a question, found a bug, or have an idea that would make this tool more useful? I would like to hear it.

This site is run by Marcio. Because the comparison tool works entirely in your browser, I never see the lists you paste, so when reporting an issue please describe what you did and what you expected rather than sending the actual data — though a small, non-confidential sample that reproduces the problem is always helpful.

I read every message, but please allow a little time for a reply.