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