#' @return <%= intro %>
#' \describe{
#' \item{N}{The total number of quartet _statements_ for two trees of _n_ leaves,
#' i.e. 2 _Q_.}
#' \item{Q}{The total number of quartets for _n_ leaves.}
#' \item{s}{The number of quartets that are resolved identically in both trees.}
#' \item{d}{The number of quartets that are resolved differently in each tree.}
#' \item{r1}{The number of quartets that are resolved in tree 1, but not in tree 2.}
#' \item{r2}{The number of quartets that are resolved in tree 2, but not in tree 1.}
#' \item{u}{The number of quartets that are unresolved in both trees.}
#' }
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