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