649
3
21
643
2
21
474
1
21
1080
0
21
756
0
21
878
2
21
834
0
21
529
0
21
702
2
21
884
0
21
664
0
21
393
7
21
504
0
21
626
2
21
879
2
21
1042
0
21
801
0
21
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Keyword(s): lesson 2