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