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