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Three Hundred - Forty-Two Commit: Implement weighted-undirected-graph-demo

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	`1`	`+from graph import Graph`
	`2`	`+# Undirected Weighted Graph Demo`
	`3`	`+G = Graph(4)`
	`4`	`+G.display_adjacent_matrix()`
	`5`	`+print('Vertices:', G.vertex_count())`
	`6`	`+print('Edges:', G.edge_count())`
	`7`	`+G.insert_edge(0, 1, 26)`
	`8`	`+G.insert_edge(0, 2, 16)`
	`9`	`+G.insert_edge(1, 0, 26)`
	`10`	`+G.insert_edge(1, 2, 12)`
	`11`	`+G.insert_edge(2, 0, 16)`
	`12`	`+G.insert_edge(2, 1, 12)`
	`13`	`+G.insert_edge(2, 3, 8)`
	`14`	`+G.insert_edge(3, 2, 8)`
	`15`	`+G.display_adjacent_matrix()`
	`16`	`+print('Vertices:', G.vertex_count())`
	`17`	`+print('Edges:', G.edge_count())`
	`18`	`+G.edges_print()`
	`19`	`+print('Edge between 1-3', G.exist_edge(1, 3))`
	`20`	`+print('Edge between 1-2', G.exist_edge(1, 2))`
	`21`	`+print('Degree', G.indegree(2))`
	`22`	`+G.remove_edge(1,2)`
	`23`	`+print('Edge between 1-2', G.exist_edge(1, 2))`

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