1626
2
21
888
0
21
1232
2
20
2195
12
20
1555
2
20
441
2
18
522
0
18
278
0
18
920
0
17
629
0
17
364
2
16
618
2
16
629
0
16
904
0
16
752
0
16
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Keyword(s): Lesson8 Water Problems