smallest lexicographic topological sort - SERP Analysis

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https://www.wikiwand.com/en/articles/Topological_sorting

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https://www.researchgate.net/publication/226093697_Polynomially_Improved_Efficiency_for_Fast_Parallel_Single-Source_Lexicographic_Depth-First_Search_Breadth-First_Search_and_Topological-First_Search

https://hal.science/hal-02391240/file/LexicographicAlgosResearchReport.pdf

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https://www.researchgate.net/publication/370808158_Delaunay_and_Regular_Triangulations_as_Lexicographic_Optimal_Chains

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