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