{HEAD ~ A second receiving unit} of {TAIL ~ the plurality} of receiving units forms a selection for the content and communicating the selection to the first receiving unit 
{ HEAD ~ A second receiving unit } of { TAIL ~ the plurality } of receiving units forms a selection for the content and communicating the selection to the first receiving unit
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH