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Each of the 16-player, fixed-degree (k = 3) graphs used in the experiment, arranged in order of efficiency. The upper row constitutes networks whose decentralized nature connotes high efficiency (short path lengths), whereas the networks in the lower row are all centralized to some degree and also exhibit significant local clustering, both of which lower efficiency. The network on the upper right is an intermediate case, being decentralized but exhibiting some local structure.
