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