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