Find the thickness of the line graph of K4.
The thickness of a graph is the minimum number of planar graphs into which the original graph can be decomposed. The line graph of a graph G, denoted as L(G), is a graph that has a _________ __________ _______ ___ ________ ________ _________ ______.
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Draw a diagram, as nice as possible, of the line graph of the Petersen graph. Write the number of vertices, the number of edges, the minimum and maximum degrees of it.
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