a rapier receiving at least two yarns from {HEAD ~ said yarn feeders} for {TAIL ~ insertion} simultaneously 
for
a rapier receiving at least two yarns from { HEAD ~ said yarn feeders } for { TAIL ~ insertion } simultaneously
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH