Body Elements
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རེག་བྱ་ reg bya is touch or tangibility, the འི་ 'i is again the genitive particle, binding this to ཁམས་, so this is the tangibility element (sprastavya-dhatu).
ལུས་ is (as earlier) body, རྣམ་པར་ཤེས་པ་ rnam par shes pa is consciousness, so this all is the body consciousness element (kaya-vijnana-dhatu.)
Later Abhidharma-Samuccaya will have a definition what touch really is, so that will be interesting.
I think you have grasped the Sanskrit also by now, so now you could show your talent and know what for example kaya-vijnana-dhatu really is, based on knowing each of these three separate words!
Next, a somewhat surprising set of elements.