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