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第22行： − ===Undirected and directed graphs===+
→Undirected and directed graphs
==Undirected and directed graphs==
'''<font color="#ff8000">无向和有向图 Undirected And Directed Graphs</font>'''
'''<font color="#ff8000">无向和有向图 Undirected And Directed Graphs</font>'''
[[Image:Labeled undirected graph.svg|thumb|250px|An undirected graph.]]
[[Image:Labeled undirected graph.svg|thumb|250px|An undirected graph.]]