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