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