#' Title
#'
#' @param a `factor`
#' @param b `factor`
#'
#' @return `factor`, combined 'a' and 'b' including levels
#' @export
#'
#' @examples
#' fbind(iris$Species, Puromycin$state)
#'
fbind <- function(a, b) {
forcats::fct_c(a,b)
}
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