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