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