If {HEAD ~ the customer} causes the machine to connect a server operated by a foreign institution, the HTML documents sent from {TAIL ~ the foreign institution} correspond to those normally provided by the foreign institution 
If { HEAD ~ the customer } causes the machine to connect a server operated by a foreign institution , the HTML documents sent from { TAIL ~ the foreign institution } correspond to those normally provided by the foreign institution
OTH HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH