a length of {HEAD ~ roving}, comprising {TAIL ~ a bundle} of flexible filaments and including: 
comprising
a length of { HEAD ~ roving } , comprising { TAIL ~ a bundle } of flexible filaments and including :
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH