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