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