A computer network diagnostic tool allows {TAIL ~ a user} of a computer coupled to a computer network to perform {HEAD ~ network diagnostics} 
A computer network diagnostic tool allows { TAIL ~ a user } of a computer coupled to a computer network to perform { HEAD ~ network diagnostics }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD