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