{HEAD ~ The sterilization} of {TAIL ~ the external surfaces} can occur with a suitable means, for example by spraying with a biocidal chemical, with H2 O2, with steam or by flooding with ozonated water 
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{ HEAD ~ The sterilization } of { TAIL ~ the external surfaces } can occur with a suitable means , for example by spraying with a biocidal chemical , with H2 O2 , with steam or by flooding with ozonated water
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH