51.   The discoveries have set off a debate about just what remains are worthy of preservation.

52.   The information he gathered set off the inquiry that would lead authorities to Manes and Friedman.

53.   The incident took place at the same location that was the scene of an anti-Castro protest two weeks ago that set off the current exodus.

54.   The latest bombing set off a round of high-level government meetings as Yeltsin and his government struggle to respond to the unprecedented campaign of terror.

55.   The mystery set off a flurry of speculation on the Internet, prompting at least one instantly constructed Web site devoted to speculation about what It is.

56.   The New York experiment has set off a wave of excitement in crime-fighting circles nationwide.

57.   The news, passed from neighbor to neighbor, sets off a flurry of preparation.

58.   The new report set off what has become a classic pattern for the current boom.

59.   The prospect that she could be queen set off an odd round of gossip in a country always heavily influenced by outsiders.

60.   The two set off Monday on the last leg of a border crossing they hoped would eventually take them to jobs in Baltimore.