# 0s represent variables that are initially unassigned

# Instance 1

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

# Instance 2

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

# Instance 3

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

# Instance 4

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

# Instance 5

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