{HEAD ~ Most preferred films} are {TAIL ~ polyolefins}, particularly polyethylene and polypropylene; polyesters, particularly polyethylene terephthalate; and, nylons all of which are well known in the an to be amenable to be printed as required above 
are
{ HEAD ~ Most preferred films } are { TAIL ~ polyolefins } , particularly polyethylene and polypropylene ; polyesters , particularly polyethylene terephthalate ; and , nylons all of which are well known in the an to be amenable to be printed as required above
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