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