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→Graph theory
===Undirected and directed graphs===
===Undirected and directed graphs===
'''<font color=""#ff8000>无向和有向图 Undirected and directed graphs'''
'''<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.]]