The respective outputs of {HEAD ~ the filters} are coupled through {TAIL ~ a multiplexer} to a squarer 
The respective outputs of { HEAD ~ the filters } are coupled through { TAIL ~ a multiplexer } to a squarer
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH