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