{TAIL ~ High quality coaxial electrical cables} employing {HEAD ~ insulation} of fluorocarbon elastomers, tetrafluorethylene propylene polymers and silicon are all suitable, with tetrafluorethylene propylene polymers being slightly preferred 
{ TAIL ~ High quality coaxial electrical cables } employing { HEAD ~ insulation } of fluorocarbon elastomers , tetrafluorethylene propylene polymers and silicon are all suitable , with tetrafluorethylene propylene polymers being slightly preferred
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