21.   In healthy people, areas of the auditory cortex that respond to different sound frequencies are of similar size.

22.   Instead, Sprint Spectrum will provide what has been called PCS, or personal communications services, by using digital equipment and a different frequency than traditional cellular.

23.   Investigators said they might have been preoccupied or might have tuned their receiver to a different frequency, the one they would need to talk to controllers once airborne.

24.   It is modifying the phones to work in other countries, such as Japan and Britain, that allocate different frequencies to cordless phones.

25.   Normal brain waves occur at different frequencies that are linked to various brain functions.

26.   PCS is a new generation of wireless communications that resembles cellular, but works on different frequencies.

27.   PCS is similar to cellular, but works on different frequencies.

28.   PCS is similar to cellular telephone service, but works on different frequencies.

29.   PCS is a new generation of hand-held phones similar to cellular, though they work on different frequencies.

30.   PCS users will ultimately be able to zap messages and talk to one another over hand-held phones that resemble cellular handsets but work on different frequencies.