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