893
2
21
1000
11
21
587
4
21
1718
7
21
748
8
21
433
9
20
733
6
20
1092
8
20
603
9
18
605
6
18
644
17
18
625
2
18
784
8
17
425
4
17
884
12
17
823
28
17
867
2
17
699
6
17
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Keyword(s): studygram