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