20
12 11 15 13 16 14 18 19 17 20 
20 11 12 13 15 18 16 14 17 19 
20 14 19 18 13 11 16 17 12 15 
12 11 14 17 20 18 19 15 16 13 
17 13 14 19 11 12 18 20 16 15 
14 13 16 17 11 15 19 18 20 12 
11 18 20 17 14 15 12 19 13 16 
20 15 12 13 17 18 16 11 14 19 
16 15 19 20 12 14 13 11 18 17 
11 15 12 17 13 14 19 18 20 16 
7 3 2 10 1 6 5 9 8 4 
5 2 4 9 1 7 3 6 10 8 
7 9 10 3 6 1 4 2 5 8 
10 1 3 9 2 8 5 7 4 6 
2 6 8 3 4 7 1 9 10 5 
4 3 8 9 7 6 1 10 5 2 
4 3 9 8 5 1 10 2 7 6 
1 10 8 9 7 2 5 6 4 3 
5 1 9 4 8 3 10 7 6 2 
2 4 3 6 7 9 1 10 5 8 
forbidden 1 16
forbidden 1 18
forbidden 1 20
forbidden 2 11
forbidden 2 12
forbidden 2 14
forbidden 2 15
forbidden 3 11
forbidden 3 12
forbidden 3 13
forbidden 3 15
forbidden 3 16
forbidden 3 17
forbidden 4 12
forbidden 4 15
forbidden 4 20
forbidden 5 13
forbidden 5 14
forbidden 5 15
forbidden 5 16
forbidden 5 17
forbidden 6 11
forbidden 6 12
forbidden 6 13
forbidden 6 14
forbidden 6 15
forbidden 6 19
forbidden 6 20
forbidden 7 12
forbidden 7 13
forbidden 7 16
forbidden 7 17
forbidden 7 20
forbidden 8 11
forbidden 8 13
forbidden 8 14
forbidden 8 15
forbidden 8 20
forbidden 9 11
forbidden 9 12
forbidden 9 13
forbidden 9 16
forbidden 9 17
forbidden 9 19
forbidden 10 11
forbidden 10 15
forbidden 10 16
forbidden 10 18
forbidden 10 19