The present invention relates to {HEAD ~ a polygonal rib structure} having {TAIL ~ ribs} directed orthogonal to one plane and intersecting each other to form polygonal shapes 
having
The present invention relates to { HEAD ~ a polygonal rib structure } having { TAIL ~ ribs } directed orthogonal to one plane and intersecting each other to form polygonal shapes
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH