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