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" ... For most of us, the word graph brings back memories (not always pleasant) of pencils and rulers and quadrille ruled paper, though a more recent generation may think instead of pie and bar charts produced in Excel from spreadsheets. However, in the last few years, another form of graph, one that goes back to a whole branch of mathematics called graph theory, is beginning to have a huge impact in business, science and the world of artificial intelligence. ... "