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