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#' Grades Data Set
#'
#' A dataset containing common grades.
#'
#' @details
#' \itemize{
#' \item x. The graphic representation of the grade
#' \item y. The meaning of the grade
#' }
#'
#' @docType data
#' @keywords datasets
#' @name key_grade
#' @usage data(key_grade)
#' @format A data frame with 15 rows and 2 variables
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