300
3
2
486
0
2
298
2
2
187
0
2
306
0
2
246
4
2
797
0
2
847
0
2
146
0
2
380
0
2
114
2
2
106
0
2
209
4
2
700
0
2
408
2
2
102
0
2
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Keyword(s): lesson