He stuck mostly with pant suits, wool shift or trapeze dresses and coats in solids, accented with a sprinkling of white-and-black stripes and large leaf prints in autumnal red, orange-red, green, purple and a rich deep blue.

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It slipped enlarged photographs of the latent prints and the prints from Mr Mitchell into transparent plastic sleeves, and marked red dots on the sleeves to suggest which of Mr Mitchell's prints matched the latent ones and where.

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If she is likely to appear in a bachelorette-party photo or red-carpet shot, she avoids wearing prints or "anything too complicated" that might look muddled in a small photo.

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In a 2011 piece, New York artist Enoc Perez, known for a brushless technique that positions his work somewhere between paintings and prints, depicts the same towers as a pair of striking red monoliths.

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As this chart suggests, July brought a small, but notable revival in sub-5% prints, which were largely absent during the choppy second quarter after a strong run during the red-hot market conditions of the first three months of 2012.

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