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