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