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