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