71.   At least one discovery set off rumors that the victim was Christina.

72.   At first police banned the march, setting off disturbances by Protestants, and then they did an about-face and allowed it, setting off disorders in Catholic neighborhoods.

73.   At the same secretly convened, predawn National Assembly session, the government also pushed through a controversial new labor law that has set off nationwide protest strikes.

74.   At the site of the Pentagon wreckage, a roof collapse set off a landslide of debris, temporarily hampering the search for bodies.

75.   Bankers Trust set off the latest wave of banking-brokerage mergers in February when it agreed to buy Alex.

76.   Because it was known that clients of Houston-based agent Carl C. Poston III were gathering that weekend for a lavish party, the call set off alarms.

77.   Because it was a new plane in its first winter of service, the incident set off alarm bells.

78.   Behind her, supporters wearing yellow T-shirts and yellow ribbons opened bottles of champagne, set off firecrackers and honked car horns.

79.   Beyond immediate damage, the crackers can install so-called Trojan horse programs that obscure their activity and can set off malignant processes at a later date.

80.   Bohr and Heisenberg are particles of atomic energy caroming off each other, potentially setting off reactions.