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Segment-based parallelism. The calculation for node 8 involves only segments 1–8, and is carried out in parallel according to Stone's algorithm. The calculation for node 12 involves segments 1,2,3,4,9,10,11,12 and is of the same nature as the calculation for node 8, but with different indexing. Calculations for segments 1–4, which are marked by the dashed line, are the same on both sides and are carried out only once.
