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