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