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