{TAIL ~ The short fibers} may be made of a single crystal such as whisker or of {HEAD ~ a polycrystal} 
{ TAIL ~ The short fibers } may be made of a single crystal such as whisker or of { HEAD ~ a polycrystal }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD