{HEAD ~ The field} of the invention is sealing and retaining {TAIL ~ assemblies} for downhole tools and more specifically downhole tools set by expansion such as, for example, packers, bridge plugs or liner packers 
{ HEAD ~ The field } of the invention is sealing and retaining { TAIL ~ assemblies } for downhole tools and more specifically downhole tools set by expansion such as , for example , packers , bridge plugs or liner packers
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