Puzzle 126 ("Rectangles", Double Choco)

I've grown really fond Nikoli-styled Double Choco puzzles; they're much less focused on intuition and more on flow, and that has made for a much more enjoyable solving experience.  I decided to construct one of my own.  This was not easy to do!  Took just over a half hour, I think.

Some day I want to construct a puzzle with this flow while also maintaining clue symmetry, but I'm not quite there yet :)

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