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Calcudoku n. 144
Game no. 5671.  (by Patrick Min)        

Software: Calcudoku Generator Ver. 8.0 - by Patrick Min
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CALCUDOKU 8x8 is a logical-mathematical game in which you have to fill a 9x9 square
with the digits 1, 2, 3, 4, 5, 6, 7, 8, 9.
You can't have the same digit in the same row or column.
For each region a number and a mathematical operation indicate that, applying that operation to all the digits in the region (note that the order doesn't matter), you must obtain that result.


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