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