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