rust-sudoku-solver/puzzles/challenge2.csv

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