| http://www.w3.org/ns/prov#value | - open end of each receptacle, each lid including a portion for supporting a portion of the closed end of the next superjacent receptacle in a stack of such receptacles, and a sealing rim extending perimetrally about the support portion and adapted sealingly to receive the lip of a respective receptacle, the closed end of each receptacle including a generally flat central portion and a perimetral,
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