720p24 on ATSC

Apparently, a station can carry 720p60 programming and still squeeze in a
channel or two of SD programming.  How many 720p24 programs could be
carried
on ATSC?  It sure seems obvious that at least 2 can be carried.  How about
3?

If they can get lots of old movies (typically shot at 24 fps) digitized at
720p24, they could have more HD streams than any other station :-)

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