# Example data frame
my_data <- dummy_data(10)
# Add extensions to variable names
new_names1 <- my_data |> add_extension(5, c("sum", "pct"))
new_names2 <- my_data |> add_extension(5, c("sum", "pct"), reuse = "last")
new_names3 <- my_data |> add_extension(5, c("sum", "pct"), reuse = "alternate")
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