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    What's the 3rd case? (or language) Test cases can be in different order between languages.

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    The observed pin is 369. The first digit of the actual pin is therefore one of 2, 3 or 6 (i.e. 3 itself, or the number to the left, or the number below) - so 963 can't possibly be the actual pin (as the actual combination can't start with 9).