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