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The object is to make it so that each row or column has 1-9 in it. Yet, you can't use the same number twice in that row or column.
So, take the first empty square. Look along the row and column it is on.. Start with number 1. IF number 1 exists in any square on that row or column, you can't use number 1. do that until you have a number that will fit.
It took me 30 min to complete it.
IcI
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