
A "classic" Sudoku puzzle is a grid 9 squares wide and 9 squares deep. The lines of squares
running horizontally are called rows, and the lines running vertically
are called columns. The grid is further divided by the darker lines
into nine 3 X 3 square "boxes".
The Challenge: Some of the squares already have numbers in them. Your task is to fill
in the blank squares.
The Rules:
Each row, each column and each box must end up containing all of the numbers and/or characters used in the puzzle (in this example the numbers 1 through 9 are used).
Each number and/or character can only appear once in a row, column or box.
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