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