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