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