Plastiki also is supplied with a nutritional guide for the crew advising them on what to eat and how to build meals that support the periods of high-level activity during the voyage.

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"A lot of these patients have been involved with a fairly high level of activity for a long time, " Stubbs said.

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This is particularly the case with a security that does not have a high level of trading activity on a given day.

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The large stretch of water being covered extends across 50 square miles over two loughs which attract a high level of leisure activity including fishing, sailing, canoeing and over-the-water flying.

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