A “client machine” is used to perform tests on network products that may be located within a communications test network using {HEAD ~ a variety} of {TAIL ~ test cases} 
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A “ client machine ” is used to perform tests on network products that may be located within a communications test network using { HEAD ~ a variety } of { TAIL ~ test cases }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL