51.   Kronos, which once made most of its own hardware, now turns to outside suppliers for much of the equipment its systems require.

52.   Lau, at Sing Tao Daily, said current Chinese typing systems require a person to learn an extensive set of codes.

53.   Most systems now require some human intervention when a previously unknown virus is found.

54.   Most systems require some type of controlling head unit for the dashboard.

55.   Most fixed wireless systems require data to travel in a line-of-sight fashion, meaning that walls and even foliage can disrupt transmission.

56.   Other systems require special wiring, new equipment and expensive service calls.

57.   Other systems require that all the moisture be removed from a specimen and that a conductive coating be placed on it.

58.   Our electoral system requires us to choose a winner.

59.   One thing upon which virtually all analysts agree is that the Social Security system requires some kind of work.

60.   Perhaps the most troublesome factor for most users is that the systems require expensive, specially made bags.