A customer computer connects to {HEAD ~ an online service provider} by phone, Internet, or {TAIL ~ other telecommunications link} 
A customer computer connects to { HEAD ~ an online service provider } by phone , Internet , or { TAIL ~ other telecommunications link }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL