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