61.   Radon reduction systems usually require no maintenance, but the components should be clearly labeled so they can be left undisturbed and so all vents have the proper clearance.

62.   Restoring full public confidence in the long-term security of the aviation system will require action on the part of Congress and the Bush administration.

63.   SCSI systems can require fiddling with special termination plugs and switch settings.

64.   Similar systems require a second operator to illuminate a target with a laser, he said.

65.   So, they say, the new system simply requires that everyone take part.

66.   Some systems already require community service credits.

67.   Some systems may require special drivers to handle bigger drives and may not be able to use all the space.

68.   Some systems require professional installation which means an additional fee.

69.   Still in the prototype stage, the new medical x-ray system requires approval by the US Food and Drug Administration, which officials expect next year.

70.   Such systems require special phones costing hundreds of dollars apiece.