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