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