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