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