| http://www.w3.org/ns/prov#value | - Use of three opening groups 403 and 404 for each group set 417 or 420 allows two adjacent PDAs 401 to be positioned at two different modular distances from each other, which distances correspond to the thickness of the wall panel in a three-way connection such that the power distribution system 400 is usable in either a two-way connection such as in FIG. 3, or a three-way connection such as in FIG
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