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