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(a) Examples of Gn,m and (b) Gn for β=2 and n=m=100. White and black circles are signals and objects, respectively. (c) First and second neighbours of the most connected signal (grey circle) in a. This and other highly connected signals are the forerunners of linking words (e.g. prepositions and conjunctions) in human language. (d) First and second neighbours of other signals (grey circles) in a.
