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