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