

2 The following graph has vertices of two types, a set H [1, 2, 3, 4, 5, 6, 7) of hubs, indicated by filled circles, and a set C {a, b, c, d, e,f} of connect
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2 The following graph has vertices of two types, a set H [1, 2, 3, 4, 5, 6, 7) of hubs, indicated by filled circles, and a set C {a, b, c, d, e,f} of connect
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