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