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