884
0
21
657
1
21
1075
0
21
879
0
21
392
0
20
430
0
20
922
0
20
663
4
20
620
1
20
832
0
20
1466
5
20
540
0
20
594
0
20
526
0
20
901
0
20
975
2
20
721
0
20
516
2
20
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Keyword(s): lesson1