#' Data.fram represents graph
#'
#' @format A data frame of wiki_graph with 18 rows and 3 variables:
#' \describe{
#' \item{v1}{v1 is the first set of nodes of the graph}
#' \item{v2}{v2 is the second set of nodes of the graph}
#' \item{w}{w is the edge between the v1 and v2 and also have weight of the edge}
#' }
#' @name wiki_graph
#' @source \url{https://en.wikipedia.org/wiki/Dijkstra's_algorithm}
#' @docType data
#'
NULL
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