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Fill in each square with a number 1-9 so that there are no duplicates
in any one row, column or 3x3 square (region).
There are three parts to solving a Sudoku puzzle: scanning, marking up, and analyzing.
For each cell in the puzzle, scan the numbers on that cell's row, column, and region
to determine if there is only one number remaining. If so, then that is the value.
Each time you find a new number, you may need to rescan previous cells.
for that cell.
Once all the cells have been scanned, identify what possible numbers could go in each cell.
This is built into the Sudoku program itself. Perform the same process as in scanning,
but type in every possibly value into each cell.
In the last step, analyze the marked cells to determine if anything can be determined.
For example: There are only 3 undetermine cells in a region with the following markup:
(1,2), (1,2), (1,2,3). In this case, the 1 & 2 must be in the first 2 cells, and the
3 must be in the third cell.