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