| http://www.w3.org/ns/prov#value | - Accordingly, the quadtion of the invention proceeds. rilateral cages are of such shape as to define the The objects of this invention are attained by cells between the adjacent undulating mats and disposing a plurality of quadrilateral skeleton maintain the walls of the cells at an angle of cages within the cells defined by the superposed between 25 and 75 degrees with the horizontal, undulating m
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