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