#' Get total value of a scrabble rack
#'
#' @param rack a string representing scrabble tiles
#' @return integer of total value of all tiles
#' @examples
#' rack_value("FFJXUUZ")
#' @export
rack_value <- function(rack){
d <-unlist(strsplit(rack, split=""))
value <- sum(tiles$points[match(d,tiles$tile)])
return(value)
}
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