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