{HEAD ~ The side} opposite {TAIL ~ the skin} on the second grid structure is preferably covered by a further inner skin, for example secured by casting or by an adhesive 
opposite
{ HEAD ~ The side } opposite { TAIL ~ the skin } on the second grid structure is preferably covered by a further inner skin , for example secured by casting or by an adhesive
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH