#' Word countries ISO code.
#'
#' \itemize{
#' \item code ISO 3 characters codes
#' \item country Full countries names
#' \item subcode Countries subcodes
#' \item subname Countries subname
#' }
#'
#' @docType data
#' @keywords datasets
#' @name countries
#' @usage data("countries")
#' @format A data frame with 4764 rows and 4 variables
#' @references \url{http://www.unece.org/cefact/codesfortrade/codes_index.html}
NULL
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