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