1590
13
21
852
2
21
2013
12
21
1106
0
20
630
0
20
865
26
20
650
0
20
615
2
19
697
0
19
341
0
19
432
0
19
604
6
19
451
0
18
984
0
18
425
2
17
481
0
17
937
7
17
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Keyword(s): math