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