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<p>disagree on which edges should be removed as part of a clique-sum operation. In some contexts, such as the decomposition of <a href="page.php?w=chordal_graph">chordal graph</a>s or <a href="page.php?w=strangulated_graph">strangulated graph</a>s, no edges should be removed. In other contexts, such as the <a href="page.php?w=SPQR-tree">SPQR-tree</a> decomposition of graphs into their 3-vertex-connected components, all edges should be removed. And in yet other contexts, such as the <a href="page.php?w=graph_structure_theorem">graph structure theorem</a></p><p>
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