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