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Viewing people as "social atoms"that obey rather simple rule (which are not unlike the laws of physics), one may discover certain (i) . Take, for example, the way channels emerge when people move in crowds. In the midst of initially (ii) movements, one person begins to follow another-in an effort to avoid collisions-and streams of movement emerge. As more people join in, there is greater pull on others to join the flow, and the particular channels become (iii) .
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