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# Importing required libraries
import sys
from collections import defaultdict
from queue import PriorityQueue

# Graph class representing the graph of edges and nodes
class Graph:
    def __init__(self):
       self.edges = defaultdict(list)

    # This method is used to add a new edge in the network.
    def add_edge(self, u, v, weight):
       self.edges[u].append((v, weight))

    # This method is to load the graph data and prepares graph
    # from it.
    def load_data(self, file_name):
       f = open(file_name, "r")
       while True:
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