| http://www.w3.org/ns/prov#value | - at least four walls protruding from each of two sides of the end, a lower wall of the at least four walls including the upper surface of a corresponding one of the groove guides, the at least four walls protruding from each of the two sides of the end being connected to each other and forming a volume defined by the at least four walls and a corresponding curved wall of the end.
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