41.   The study, published in the current issue of Stroke, the journal of the American Heart Association, did not pinpoint a single cause for the discrepancy.

42.   There is no single cause for the disparities, the panel said, but quality of insurance does play a role.

43.   They foolishly believe golf is good exercise when it is actually the single largest cause of stress and mental illness in America.

44.   This time, there is no single cause.

45.   To combat problem behavior, parents and educators often want to pinpoint single causes, Blum said.

46.   As in all collapses-the fall of communism, the decline of coal-mining-there is no single cause.

47.   Both the lobstermen and the scientists who attended the conference said there is no readily identifiable single cause for the lobster deaths.

48.   But the scientists said Thursday they could not find enough evidence to link the illnesses to any single cause.

49.   In most protected areas, gill-netting -- the single biggest cause of dugong deaths -- is banned.

50.   It singled out government inaction as the single most important cause.