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