The advantages of heterogeneity and {HEAD ~ concurrency} of the distributed system are thus extended to {TAIL ~ its switched communications links} with external switched networks 
extended to
The advantages of heterogeneity and { HEAD ~ concurrency } of the distributed system are thus extended to { TAIL ~ its switched communications links } with external switched networks
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH