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