How about this:
s = c("aa", "bb", "cc", "", "aa", "dd", "", "aa")
n = c(2, 3, 5, 6, 7, 8, 9, 3)
b = c(TRUE, FALSE, TRUE, TRUE, FALSE, TRUE, TRUE, FALSE)
df = data.frame(n, s, b) # df is a data frame
I want to display df with no value in s occurring more than once. Also, I
want to delete the rows where s contains "".
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