41.   The joy of disinflation, however, will increasingly give way to fears of an actual deflation, which could cause economic collapse.

42.   The others jumped or fell into holes, the report said, causing the collapse.

43.   The officials said it was unclear what had caused the collapse.

44.   They said the weather appeared to have caused the collapse.

45.   Weiss came to believe that the effects of the drought reached downriver to the heart of Mesopotamia, causing the collapse of the Akkadian Empire.

46.   What caused the collapse of Maya civilization in Central America in the eighth and ninth centuries has been the subject of much study and speculation.

47.   Police investigators determined that the collapse was caused by a gas explosion but it was still unclear what caused the leakage of gas, the report said.

48.   A water-main break near the tunnel added to the tumult, causing the collapse of part of a major thoroughfare and power outages.

49.   A water-main break caused by the derailment added to the problems, causing the collapse of part of a major thoroughfare and power outages.

50.   An OSHA investigation found an engineering mistake had caused the collapse.