#' Four-point grading scale
#'
#' Values for converting between letter grades and a four-point numeric scale.
#' Use \code{average} when converting from letter grades to numeric values, and
#' \code{lowest} when converting from numeric values to letter grades.
#'
#' @name grades_4pt
#' @docType data
#' @seealso \code{\link{grades_percent}}
#' @usage data(grades_4pt)
#' @keywords datasets
NULL
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