1056
0
20
570
0
20
763
26
20
605
0
20
487
6
19
559
2
19
616
0
19
323
0
19
397
0
19
430
0
18
909
0
18
1082
12
18
396
2
17
446
0
17
841
7
17
241
0
17
526
0
17
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Keyword(s): mathematics