| http://www.w3.org/ns/prov#value | - 2 arranged in rows and columns (in the figure only the front poles are seen), and a plurality of pairs of coplanar arched bars 4 connected to the top portion of the poles at both ends of both of the bars constituting such a pair, except for the bars atthe lateral sides of the structure, wherein one end of a bar is connectable to the ground.
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