If you want to test custom cases using CodinGame’s IDE, you can do so by enabling EXPERT mode, found under SETTINGS on the left of the puzzle statement.
Maybe, but the issue I’m seeing isn’t the 1/1000 offset; What I’m seeing is being off every ~984880 iterations on the license number. Thanks for your input too :-).
Thank you, and thank you for using caps so that I can clearly see what you’re trying to say 
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My math isn’t the strongest, but being off by one on the wrapping value here would result in being off by two after 999*999 (=998001) wouldn’t it?
I appreciate your suggestions for fixing the code, and what you have done to help me out. Unfortunately I’m using C# and not jerk to write my code :-).
Well, I didn’t use caps so that you could clearly see them; I copied from the buttons themselves, which are labelled in caps! 
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