#' Left-right order
#'
#' Reorder a vector \code{x}, starting at a given index \code{i} and proceeding
#' rightward then leftward.
#'
#' @param x A vector
#' @param i An integer between 1 and \code{length(x)}.
#' @export
#'
#'
#'
#'
#'
sort_rightleft <- function(x, i) {
n <- length(x)
ord <- rightleftorder(n, i)
x[ord]
}
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