I've been hoping that people on StackExchange can give me ideas on how to come up with an input that would lead to a false positive.

I do have a repl link

So, may I continue to post my question? I know it seems low effort merely because the question relies heavily on the code itself.

Edit: To help accommodate for the "low-effort" question, I will try to explain how the code works in the question.

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    \$\begingroup\$ This is the meta site for Code Golf Stack Exchange, not for Stack Exchange in general or Stack Overflow in particular (the latter probably being where your question should go). We just host competitions. We don't help with debugging code. \$\endgroup\$ – Adám May 9 at 22:06
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    \$\begingroup\$ For places you might post such a question on Stack Exchange, yours is a bit of a weird one. My first thought was CS (cs.stackexchange.com), but the question isn't really about Exact Cover as much as your particular algorithm. Nor is it a code improvement or debugging question for StackOverflow, since your code presumably works fine for what it implements, but the question is where it doesn't match Exact Cover. It might be too localized to your specific needs for SE, honestly. Maybe consider looking into and asking about generic automatic testing or counterexample-finding libraries. \$\endgroup\$ – xnor May 9 at 22:18
  • \$\begingroup\$ Are you asking whether you can ask it here or whether you can ask it somewhere on stackexchange. If the former the answer is very likely no, if the later this is off topic. \$\endgroup\$ – Ad Hoc Garf Hunter May 10 at 3:19

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