Operating jobs are mostly local and last the length of the unit, e.g.

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The police marine unit patrols the 89-mile (143km) length of the Dorset coast as well as responding to inland flooding emergencies.

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This incessant march of energy density (more energy per unit of raw material) has undeniable logic extending along the entire length of the arrow of progress.

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Out of the ten patients in her unit, she said, only two were likely to leave the hospital for any length of time.

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