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