{HEAD ~ said introducing and mixture forming means} comprising {TAIL ~ a wax medium} containing octenol, said medium having a porous exterior for allowing gaseous octenol to escape and mix with discharged carbon dioxide in the housing 
comprising
{ HEAD ~ said introducing and mixture forming means } comprising { TAIL ~ a wax medium } containing octenol , said medium having a porous exterior for allowing gaseous octenol to escape and mix with discharged carbon dioxide in the housing
HEAD HEAD HEAD HEAD 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