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