#' @title wine
#' @description wine data set, contains three different kinds of wines' data.
#' @docType data
#' @keywords datasets
#' @name wine
#' @usage wine
#' @format a data.frame contains 178 observations and 14 variables
#' @source wine data is originally from UCI Machine Learning Repository \url{http://archive.ics.uci.edu/ml/datasets/Wine}
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