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