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