For example, the client with {HEAD ~ his communications system} is traveling by train and can listen to {TAIL ~ music} 
For example , the client with { HEAD ~ his communications system } is traveling by train and can listen to { TAIL ~ music }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL