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