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