The ones who left tended to share certain characteristics: they were at the top academically, and they were outgoing and lively.

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Though Mr. Pellizzoni, the 39-year-old founder of Maurizio Pellizzoni Design, says each project is tailored to the client, his designs tend to share certain characteristics.

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They are split into dozens of tribes, but share certain characteristics.

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These regions share certain over-arching characteristics such as crime levels, resources and pollution.

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