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