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# Create the 'month' column
df %>%
mutate(month = str_sub(birthday,1,2))
# Create the 'day' column
df %>%
mutate(day = str_sub(birthday,3,4))
# Create the 'year' column
df %>%
mutate(year = str_sub(birthday,5))
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iris %>%
rowwise() %>%
mutate(Max.Len= max(Sepal.Length,Petal.Length))