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