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