code: public static Graph<String, String> loadUndirectedGraphEdgeListFile(String path, int numVertices, String delim)
                      throws IOException {
          return loadUndirectedGraphEdgeListFile(path, numVertices, delim, true);
      }
docs: Simple method for loading an undirected graph, where the graph is represented by a edge list with one edge
  per line with a delimiter in between<br>
  This method assumes that all lines in the file are of the form {@code i<delim>j} where i and j are integers
  in range 0 to numVertices inclusive, and "<delim>" is the user-provided delimiter
  <b>Note</b>: this method calls {@link #loadUndirectedGraphEdgeListFile(String, int, String, boolean)} with allowMultipleEdges = true.
  @param path Path to the edge list file
  @param numVertices number of vertices in the graph
  @return graph
  @throws IOException if file cannot be read