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Upward Graph Construction. The lists M, A, R, each containing modified nodes, added nodes, and removed nodes, respectively, are computed from the two versions of GO, GOt1 and GOt2, by the procedure DIFF. Each element of the lists M, A, R is used as a leaf node for the upward traversal to the root node, constructing an individual subgraph. These subgraphs are subsequently merged together, and colour-coded.
