# This is the data corresponding to the very hard sudoku in
# the Sunday Times 4 April 2020.

 0 0 1  0 0 0  0 0 0
 4 0 0  0 9 0  0 0 0
 0 0 5  8 0 0  6 3 7

 0 0 0  0 0 9  0 0 3
 7 0 6  4 0 2  5 0 9
 8 0 0  1 0 0  0 0 0

 2 9 8  0 0 5  3 0 0
 0 0 0  0 7 0  0 0 8
 0 0 0  0 0 0  1 0 0

