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