41.   An accident serious enough to halt service occurs on average every three days.

42.   An arrest in the killing, which occurred on Christmas, may be as far away as next summer, Boulder officials suggested on Thursday at a news conference.

43.   An icy mixture will occur on the northwest periphery of the rain in Wisconsin.

44.   An important tactical shift occurred on Saturday, when the administration learned that bin Laden had made another tape available to Al Jazeera.

45.   An ordinary observer might have regarded what occurred on the train as a relatively simple incident.

46.   And Fox and others note that the World Trade bombings occurred on the anniversary of the defeat in Kuwait.

47.   And it occurred on a buried thrust fault that is common at the base of mountain ranges that lace the Los Angeles area, the scientists said.

48.   And it occurred on a day when a sharp drop in commodity prices sent bond prices soaring and interest rates sharply lower.

49.   And in fact the Federal Election Commission assumes that this coordination occurs on the logical assumption that parties spend money to benefit their candidates.

50.   And so it is no coincidence that the great achievement of Charles Lindbergh occurred on the horizon, where the American dream has always been richest and most flamboyant.