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