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