The system also includes a first receiving unit of 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 {TAIL ~ a first memory} of {HEAD ~ the first receiving unit} 
The system also includes a first receiving unit of 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 { TAIL ~ a first memory } of { HEAD ~ the first receiving unit }
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 OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD