Combiner 18 typically includes {HEAD ~ a plurality} of {TAIL ~ weighting elements} 26 and a summer 28 
of
Combiner 18 typically includes { HEAD ~ a plurality } of { TAIL ~ weighting elements } 26 and a summer 28
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH