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  2. File:Square sum problem graph.svg - Wikipedia

    English: A planarised graph of Numberphile's square-sum problem up to 24 by CMG Lee. The sum of any two nodes connected with an edge is a perfect square. The challenge is to find a Hamiltonian path through all the nodes.


  4. Index of Singapore-related articles - Wikipedia

    This is a list of Singapore-related articles by alphabetical order.To learn quickly what Singapore is, see Outline of Singapore.Those interested in the subject can monitor changes to the pages by clicking on Related changes in the sidebar.