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