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