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