| http://www.w3.org/ns/prov#value | - ing between the cover and the bowl, securing means for securing the cover to the bowl, said securing means including a track comprising a first groove formed in the inner surface of the side wall of the cover and a second groove formed in the outer surface of the side wall of the bowl and being aligned with the first groove, an opening formed in the cover for providing an entrance to the track, an
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