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