Nothing
## trimws was added in R 2.3.0. If we're using a previous version of
## R we need to define it.
if (!exists("trimws", mode = "function")) {
trimws <- function(s) {
s <- sub(pattern = "^[[:blank:]]+", replacement = "", x = s)
s <- sub(pattern = "[[:blank:]]+$", replacement = "", x = s)
s
}
}
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