577
4
21
923
2
21
932
0
21
1138
0
21
964
0
21
490
0
20
449
0
20
1005
0
20
694
4
20
666
1
20
1528
5
20
565
0
20
654
0
20
598
0
20
989
0
20
569
2
20
1069
2
20
766
0
20
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Keyword(s): lesson1