Denials of exempt status are about the only source of humor to be found in the entire body of private letter rulings.

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Mrs May's intervention came in a letter to professional standards body the College of Policing.

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It works because many cases of muscular dystrophy are caused by mutations in the dystrophin gene (incidentally, one of the longest genes in the body) that make the entire genetic code for the protein shift by one letter.

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On the day before the spy scandal broke, a letter surfaced from the two senior members of the House Permanent Select Committee on Intelligence (a bipartisan body) based on what the committee had found when combing through 19 volumes of material, much of it classified.

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