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