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