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