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