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