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Argyle Sudoku is a Sudoku Variant that has various additional (diagonal) regions.
Remarkably, it does not have the main diagonals, such as in Sudoku-X
4 of the extra regions contain 5 cells, and 4 of them contain 8 cells.
Because they do not contain the full digit range (1-9), the logic you use differs from regular Sudoku, similar to the way that you use partial elimination logic when solving Isosudoku that also has some partial regions in it.