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    Would there ever be a pin string containing '1234\n567890'? Shouldn't code validate one PIN per call? This is unbelievable...

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    That's not what Kysovich is talking about: in Ruby, initial solution already includes a code.

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    This comment is hidden because it contains spoiler information about the solution

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    Wow, it is a real challenge, like coding online calculators. Nice one

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    It seems Ruby is the original language, and it could be the intention of the author to provide a hint with this. Though I agree there should not be that, and other languages don't have it.

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    Is this okay that Ruby translation has an answer from the beginning? A single line that passed all tests but attempt? I guess it is not fair enough for kyu 5