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