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