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