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