{HEAD ~ The supporting element} is connected to {TAIL ~ a non crosslinked plastic covering} to form an asymmetric structure 
is connected to
{ HEAD ~ The supporting element } is connected to { TAIL ~ a non crosslinked plastic covering } to form an asymmetric structure
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH