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BP case begins Monday in New Orleans and could take years.

Deepwater Horizon oil spill: BP reaches $7.8-billion settlement

Deal affects some 100,000 people affected by Gulf of Mexico disaster.

A Louisiana National Guard blackhawk flies over marshland on April 19, 2011 in route to Middle Ground in southern Louisiana. The 2010 BP oil spill coated Gulf coast marshes and beaches.

John Moore

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