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Project: sagenb.org published worksheets
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[2 6 7 8 5 4 1 9 3]
[4 8 9 1 3 7 5 2 6]
[3 1 5 6 9 2 8 4 7]
[6 2 1 3 7 8 9 5 4]
[5 9 8 4 6 1 7 3 2]
[7 4 3 9 2 5 6 1 8]
[1 5 6 2 8 3 4 7 9]
[8 3 4 7 1 9 2 6 5]
[9 7 2 5 4 6 3 8 1]
[x == 0, x == 3]
9/2