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