553
4
21
324
1
21
874
0
21
663
4
20
394
0
20
439
0
20
927
0
20
868
9
20
400
0
20
659
2
20
541
0
20
904
0
20
813
0
20
1149
0
20
527
0
20
808
0
20
689
0
20
1470
5
20
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Keyword(s): lesson 1