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