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