how to piping a flite and selection for a data.frame

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别那么骄傲
别那么骄傲 2020-12-02 00:55

I have a data that looks like this:

Sample data can be build using codes

df<-structure(list(ID = c(1, 1, 1, 2, 2, 3, 3, 3), Date = c("D         


        
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