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