{TAIL ~ A rubber thread} includes in cross section {HEAD ~ a first rubber portion} and a second rubber portion 
{ TAIL ~ A rubber thread } includes in cross section { HEAD ~ a first rubber portion } and a second rubber portion
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH