573
4
21
923
2
21
930
0
21
1137
0
21
955
0
21
443
0
20
484
0
20
1004
0
20
693
4
20
664
1
20
1528
5
20
565
0
20
653
0
20
596
0
20
988
0
20
752
0
20
564
2
20
1061
2
20
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Keyword(s): lesson1