51.   The voluminous Starr report was supposed to be a more closely guarded secret than who shot J.R. Ewing, but surprise!

52.   The terms of rebate agreements are considered proprietary information and are a carefully guarded secret.

53.   Their existence has been a carefully guarded secret for nearly two years.

54.   The total gross gaming revenue at Indian casinos, previously a highly guarded secret, will be made public.

55.   These are closely guarded secrets now.

56.   This tradition has often grated on more conservative business cultures that wanted to keep information about computer security a closely guarded secret.

57.   To protect them from vandalism, the exact location is a closely guarded secret.

58.   Warehouse locations around the country are tightly guarded secrets.

59.   Whatever McDermott told the board that day was a closely guarded secret for six months.

60.   Written in one long chapter, the book is filled with closely guarded secrets.