#' A graph with 6 nodes.
#'
#' This dataset contains details about a graph structure. This graph has 6 nodes
#' whith different weight in each edge to another nodes.
#'
#' @format A data frame with 18 rows and 3 columns:
#' \describe{
#' \item{v1}{numer of a node}
#' \item{v2}{number of the related node to
#' corresponding element in v1}
#' \item{w}{weight of the edge}
#' }
#'
#' @source \url{https://en.wikipedia.org/wiki/Dijkstra\%27s_algorithm}
#'
"wiki_graph"
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