51.   It came after a long series of unfruitful sexual adventures.

52.   It is a long series of bomb craters, really, mixed with dirt, mud and, occasionally some asphalt.

53.   It contains a long series of generally brief personal biographies, articles and an audio-video section.

54.   It is a long series of concrete arches, with the middle quarter missing.

55.   It is a long series of bomb craters, really, mixed with dirt, mud and occasionally some asphalt.

56.   It is hard to diagnose in the early stages and requires a long series of deep-tissue injections in its late stages.

57.   It has consisted of a long series of attacks and counterattacks, jihads and crusades, conquests and reconquests.

58.   It was only his third veto since taking office, and the first of a long series he has threatened in the budget battle.

59.   It was the most recent in a long series of disappointments.

60.   It was the third consecutive profitable quarter for IBM after a long series of losses, and its stock surged.