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No. they just can't be repeated in the row column or 3x3 box
ie.
456 789 123
123 456 789
567 891 234
789 123 456
234 567 891
678 912 345
891 234 567
345 678 912
912 345 678
Although as I am writing this they all do add up to 45 because the same digits are always used 9+8+7+6+5+4+3+2+1=45
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