31.   The resulting system could have a huge angular momentum with a very well-defined direction.

32.   The social system has certain basic needs which must be met if it is to survive.

33.   The system does have its limitations.

34.   The system had a breaking point, we soon discovered.

35.   The system has previously undergone six months of preliminary tests in the same Redwood City neighborhood, with officers firing blanks.

36.   The system has the added advantage of recordable DVD drives.

37.   Thus if the engine fails or the guidance system has a brainstorm, the risk of blowing up friendly forces is minimised.

38.   While the system proposed now has a less ambitious goal than Star Wars, the task is still very difficult.

39.   With ballast weights at each blade tip, the whirling rotor system had tremendous inertia.

40.   The penurious school system had to lay off several teachers.