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Test Case Sources

http://sudopedia.enjoysudoku.com/Invalid_Test_Cases.html

Observations

Find a hidden single, skip FindLowestValue.
If Last, explore others before coming back. Solutions seem to always be a run of singles and guesses.

Other Notes

Good for visualising branches: 1.849.....9.............7......3....62.....4....85..1....1....6.7.....93..5......
Could add naked pair removals to the ConsoleSolveVisualiser.