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