41.   A series of such oscillations, aided perhaps by Marine erosion, is probably an important cause of island formation.

42.   A series of thuds brought her to her feet.

43.   A series of twitches builds up muscle tension into a sustained contraction.

44.   A series of two-seat conversions were undertaken, both for training and also to carry observers on test work.

45.   A series of vans had rolled up at night outside the side door.

46.   A series of violent attacks has left the peace talks in shreds.

47.   A series of wavy lines appeared on the video monitor.

48.   A series of welfare laws followed, promising a gradual transformation of Britain.

49.   A small squadron could make a series of relay runs, each programmed for a few specific targets.