{TAIL ~ Recovery} of methane from {HEAD ~ the coal beds} can also be facilitated by the injection into the formation of an inert stripping gas such as nitrogen 
{ TAIL ~ Recovery } of methane from { HEAD ~ the coal beds } can also be facilitated by the injection into the formation of an inert stripping gas such as nitrogen
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH