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