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