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