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