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