41.   DNA is a long molecule that looks like a twisted ladder, with pairs of chemical bases that scientists refer to with letters for simplicity.

42.   Ford also drafted letters for its workers to send to Congress.

43.   He has written letters to the media, the FBI and left letters for his neighbors.

44.   He left a letter for her with the underground.

45.   He said he was carrying a letter for Jiang from Clinton.

46.   He knows some writers well enough, she says, that in the case of Berger, for example, the author and Gottlieb have exchanged letters for years.

47.   Her allies assailed the military for effectively branding her with a scarlet letter for allegedly committing an act that many male officers have done with impunity.

48.   He was told to write a letter for the record.

49.   He wrote letters for illiterate shipmates.

50.   Her letter for Gerta, while brief, was artful.