{TAIL ~ Particularly the fibrillating gas} is a gaseous material such as {HEAD ~ air}, nitrogen, steam, etc 
{ TAIL ~ Particularly the fibrillating gas } is a gaseous material such as { HEAD ~ air } , nitrogen , steam , etc
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH