How to remove subsets of data from my data frame

General
1

I have a large dataset with 5,158,407 entries and 87 variables. I would like to select a subset of the entries (rows) which correspond with three categories within one of the variables.

2

Let's say your data frame is called DF and you want to keep those rows that have the value A, B or C in the column called Group.

library(dplyr)
DF_filtered <- filter(DF, Group %in% c("A", "B", "C"))

If you cannot adapt that example to what you want to do, please explain in more detail what you need to accomplish.

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