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===Total graphs=== The total graph {{math|''T''(''G'')}} of a graph {{mvar|G}} has as its vertices the elements (vertices or edges) of {{mvar|G}}, and has an edge between two elements whenever they are either incident or adjacent. The total graph may also be obtained by subdividing each edge of {{mvar|G}} and then taking the [[Graph power|square]] of the subdivided graph.<ref>{{harvtxt|Harary|1972}}, p. 82.</ref>
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