And all this assumes you can make an average of 6 bcf per well.

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The government plans to make available enough land for an average of 20, 000 private residential flats each year in the next decade.

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"To drop rents on a new, state-of-the-art building to make them comparable to buildings in Midtown that are an average of 75 years old doesn't reflect what we believe to be the immediate value of the space, " said Theresa Miller, a Prudential spokeswoman.

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Remarkably, the nurses and doctors were observed to make an error in just one per cent of these actions but that still amounted to an average of two errors a day with every patient.

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With an average age of 62 the customers had very little opportunity to make up for any investment losses.

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An average annual real GDP growth rate of 3.5% would make all of the financial problems of Social Security disappear, with no tax increases and no changes in benefits.

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Assuming an average of 2.5 children per household, Santa would have to make 842 million stops on Christmas Eve and travel 221 million miles to reach every household.

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To make matters worse, the average university course lasts six years and four months, compared with an OECD average of four years and four months, according to Mr Beyer.

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Cockatoos have an average life span of 40 to 70 years, although it is not unheard for some cockatoos to make it to the ripe old age of 80.

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