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