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