1 2
2 3
3 5
4 7
5 191
6 373
7 13931
8 757
9 797
10 19991
11 77377
12 77977
13 79997
14 1987891
15 3799973
16 7977797
17 9889889
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32 989998999899989
33 38899999999999883
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35 98999899999899989