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