When I was about five, I learned what an "oblong" was. Or so I thought. I was convinced it was just another name for a rectangle, but Google Image Search suggests it's a rectangle with rounded corners. Have I just been wrong for the last three decades? https://www.google.com/search?tbm=isch&source=hp&biw=1439&bih=809&ei=PRDzWuOTM4mdkgXAqZmABw&q=oblong&oq=oblong&gs_l=img.3..0l10.396.972.0.1368.7.5.0.2.2.0.116.408.2j2.4.0....0...1ac.1.64.img..1.6.414.0...0.d9bXIxXjBY0 …
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In that case, I'm with you.
I inserted some extra punctuation between "rectangles" and "except" to make it work.