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