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