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