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