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