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