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Assume the \({\text{u _{\text{i \) follow multivariate normal distributions with mean 0 and d-dimensional unstructured covariance matrix , such that u i N d (0,)

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it is also highly practical, making it an ideal accessory for both beginners and experienced vapers alike

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Until recently, this epidemic of chronic disease and premature death affected mainly the populations of rich countries, but it is rapidly shifting to the developing world

Sunak last year proposed plans to eventually make the UK a smoke-free nation