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