Free ends of {HEAD ~ roving} protrude from borehole openings and are splayed apart into {TAIL ~ individual filaments}  
Free ends of { HEAD ~ roving } protrude from borehole openings and are splayed apart into { TAIL ~ individual filaments }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH