I want a mechanism by which if an Org headline has
TAGX2 is also added to it. This can happen at capture time (preferable) or some kind of a
cron job that runs every x minutes, parses all headlines and adds tags as needed.
Of course, if
TAGX2 is already added, that headline should be left alone or we will have
:TAG1:TAGX2:TAGX2: kind of situation!