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