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