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