a source of {HEAD ~ octenol}, separate from the canister containing carbon dioxide, provided in {TAIL ~ the housing} 
a source of { HEAD ~ octenol } , separate from the canister containing carbon dioxide , provided in { TAIL ~ the housing }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL