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