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Thanks got the answer.
What's the 3rd case? (or language) Test cases can be in different order between languages.
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).
Why there is no 963 in 3rd test case