Does anyone know what they stand for in an autoscan of a tv tuner?

In article <ppf%f.19886$nA3.2***@news-wrt-01.rdc-nyc.rr.com>,
TonyB  <T***@nyc.rr.com> wrote:
Harmonically Related Carriers
Incrementally Related Carriers

These are frequency assignment techniques to reduce the effect of
beat-product interference between carriers.

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Is there a plug-in for . . .
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