#' @references
#'
#' Henery, R. J. "Permutation probabilities as models for horse races."
#' Journal of the Royal Statistical Society: Series B (Methodological) 43, no. 1 (1981): 86-91.
#' \url{http://dx.doi.org/10.1111/j.2517-6161.1981.tb01153.x}
#'
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