879
2
21
885
0
21
660
1
21
1076
0
21
879
0
21
438
0
20
394
0
20
926
0
20
663
4
20
621
1
20
1470
5
20
541
0
20
599
0
20
527
0
20
904
0
20
721
0
20
516
2
20
976
2
20
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Keyword(s): lesson1