Why do some channels have 3 channels listed in the guide? I understand there is usually a lower channel number for SD and an equivalent high channel number for HD, but sometimes there is an intermediate channel number as well. In the examples below, all of them have the same programming. There are more examples, but I just listed 3. AMC channels 63, 550 & 1652 Animal planet channels 36, 254 & 1622 CNN channels 46, 311 & 1630 I'm trying to (painfully) go through my channel list and remove duplicate channels and only leave HD channels when SD channels exist. Looks like when I'm finished I won't be getting the 200+ channels that Time Warner Austin says I get for my monthly sub. Also, I've very concerned that after I go through all of this trouble that any glitch or software reset might erase all of my efforts. It would be so nice if one could backup this type of stuff with the ability to restore it in such a situation.