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