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