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