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