51.   Bell says changes occurred on a nightly basis.

52.   A fifth change has since occurred.

53.   A profound change has occurred in the balance of power so carefully constructed by those who framed the Constitution.

54.   A senior administration official said that until a change in government occurs, containment was the only viable policy at this time, politically and diplomatically.

55.   Actually, a significant change has occurred the past few seasons, not so much to Thomas but to the position he plays.

56.   Against this backdrop, many palliative-care experts, including Keay, are skeptical that real changes can occur.

57.   All these changes are occurring amid an almost total lack of detailed information about substance abuse among welfare recipients.

58.   Broad changes are occurring as CNN tries to restructure.

59.   But a drastic change has occurred in the race-for-the-plane routine.

60.   But a subtle change has occurred in the dynamics of the House.