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