Please will you implement my favourite variation?

A. No, almost certainly not. I just don't have the time, nor the willpower, to work out the logic for any variations. Sorry.

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I really love your program. It eliminates the hassle of using paper and pencil, the pencil marks feature is incredible, and strongly recommend your program to any Sudoku enthusiast. Thanks again for the many hours of solving pleasure, and the many more to come.
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