Thanks for posting this thread. I, too have wondered what these letters mean, AND what "second line" meant. I've lurked for a long time and
whenever i try to sit down and figure it out in the past, i get sidetracked or run out of time with all the information on this website.
I ended up finding the faq thread, which had a section on flags.
I'm in the process of trying to figure out how posting a link works, though. I'll know shortly if this particular attempt was successful.
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