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