Inexact analogies, all of them, but close enough to fall into the gray zone.

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Those of us with long careers in journalism have moved in and out of the gray zone between journalism and advertising.

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He put religion and political views in the gray zone category.

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Even with the current guidelines, Al-Khatib said, some patients may fall into a gray zone and that each physician needs to use clinical judgment to make recommendations.

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The truth is that, despite many advances, much of medicine still exists in a gray zone where there is not one right answer.

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