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