1569
2
21
852
0
21
1172
2
20
2062
12
20
1461
2
20
496
0
18
249
0
18
405
2
18
885
0
17
608
0
17
344
2
16
857
0
16
709
0
16
595
2
16
595
0
16
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Keyword(s): Lesson8 Water Problems