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