#' @param tree An object encoding the tree structure. Can be one of three
#' formats: (1) an `hclust` object (if tree is binary), (2) a `dendrogram`, or
#' (3) a generalization of an hclust object to the case of non-binary trees,
#' which we call an hc_list object. An hc_list object is a list of
#' length-\code{num_interior_nodes} where the ith item in the list contains
#' the child nodes of the ith node in the tree. The negative values in the
#' list indicate leaf nodes.
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