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ell, all possible entries that will not contradict the One Rule with respect to the n cells. If a celle ends ⭕️ up having only one possibles entry, it is a "forced" entre you should fill in. The Math Behind S the fact ⭕️ that every row, column and block must ntain each of the numbers 1 to 9 once. Therefore, the total of all ⭕️ num bers in one roW, |