{HEAD ~ A plurality} of {TAIL ~ such containers} can be stacked upon the upper side of the geometrically indexing support structure, and can be extended both horizontally and vertically to construct a generally pyramidally shaped structure extending to a substantial vertical height 
{ HEAD ~ A plurality } of { TAIL ~ such containers } can be stacked upon the upper side of the geometrically indexing support structure , and can be extended both horizontally and vertically to construct a generally pyramidally shaped structure extending to a substantial vertical height
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