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