#' Easy require/library.
#'
#' @param x Vector of quoted package names to load.
#' @examples
#' req(list("XML", "doMC", "plyr", "RCurl", "stringr"))
#' @export
req <- function(x) {
lapply(x, FUN = function(X) {
do.call("require", list(X))
})
}
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