The two sides of the cable ducts connect. It wasn't a surprise, but I was surprised that I could only share one of the eight pairs. I still haven't figured out how to parse the rest. The edges are sharp so I'm afraid of cutting my fingers if I press too hard. They're useless if I can't take them apart to get the wires in! I can't comment on the rest of the functionality as I couldn't get past "pushing" the duct parts.
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