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