| http://www.w3.org/ns/prov#value | - end including a plurality of bosses, a first pair of the second endcap bosses contacting the substantially planar uninterrupted exterior faces of the first channel member about the second end thereof, the first pair of second endcap bosses providing a clearance between the interior surface of the second endcap and the substantially planar uninterrupted exterior faces of the first channel member, a
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