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