Thanks!
I figured out the "not format:lrf" part shortly after posting, but was stumped by how to do "no format". Although it makes perfect sense when you point it out.
I believe, however, that the advanced search window has a small bug -- typing "format:lrf" in the exclude box and making no other entries should give the same result as searching for "not format:lrf" in the main search box. Instead, it gives the same result as searching for "format:lrf" <<<<note missing "not"!!!
Xenophon
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