Failure to properly log off, unwittingly emailing a confidential document, using a thumb drive to bring work home, peer-to-peer file sharing, and other routine tasks that inadvertently create risks of exposing sensitive data to theft or misappropriation are not usually the results of malice.

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Were they fully merged--they remain distinctly separate despite sharing a chief executive and such tasks as purchasing, tech networks and some car chassis, engines and transmissions--the amalgam would be the fourth-largest carmaker on the planet.

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