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