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