{HEAD ~ The system} also includes a first receiving unit of the plurality of receiving units that is selected by {TAIL ~ the network} to record content corresponding to the request in a first memory and storing the content in a first memory of the first receiving unit 
is selected by
{ HEAD ~ The system } also includes a first receiving unit of the plurality of receiving units that is selected by { TAIL ~ the network } to record content corresponding to the request in a first memory and storing the content in a first memory of the first receiving unit
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL 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 OTH OTH OTH OTH OTH OTH