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Graph substructuring procedure from fragment library point of view. (A) Calculation of the new Laplacian matrix and its corresponding topology ID of subgraphs made of vertices {1, 2, 3, 5}. (B) Extraction of the 3D-subgraphs and 3D-subfragments of the subgraph {1, 2, 3, 5}. Blue dots represent the additional vertices in 3D-graphs.
