
0 0 2  9 0 0  0 0 0
4 0 1  0 0 0  0 6 0
8 0 0  0 0 5  0 0 0

0 0 0  0 2 0  3 0 0
5 0 0  0 0 0  0 0 2
0 0 3  0 4 0  0 0 0

0 0 0  4 0 0  0 0 8
0 2 0  0 0 0  6 0 9
0 0 0  0 0 1  7 0 0

Challenge sat15jan22
...soln flows after
setting m(6,4)=1 (see x3r.png)
...contradiction by
setting m(6,4)=5!
