421
3
28
562
0
28
546
2
28
652
0
28
641
1
28
1264
5
28
1161
1
28
1354
31
28
603
0
28
1205
2
28
3398
43
28
2328
17
28
314
0
28
443
1
28
767
2
28
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Keyword(s): math