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