840
2
21
1736
12
21
1099
0
20
617
0
20
841
26
20
641
0
20
484
2
20
600
2
19
687
0
19
338
0
19
426
0
19
578
6
19
449
0
18
967
0
18
422
2
17
471
0
17
913
7
17
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Keyword(s): #math