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