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