The system also includes {HEAD ~ a first receiving unit} of {TAIL ~ the plurality} of receiving units that is selected by 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 
of
The system also includes { HEAD ~ a first receiving unit } of { TAIL ~ the plurality } of receiving units that is selected by 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
OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH