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