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