A group of {HEAD ~ rods} having {TAIL ~ the desired fuel enrichment} and additive types is placed on a first queuing table 
having
A group of { HEAD ~ rods } having { TAIL ~ the desired fuel enrichment } and additive types is placed on a first queuing table
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH