{HEAD ~ The inert gas} is not reactive with {TAIL ~ the methane} or with the subsequently injected hydrogen and functions to reduce the methane partial pressure at a given coal bed total pressure to promote methane desorption 
is not reactive with
{ HEAD ~ The inert gas } is not reactive with { TAIL ~ the methane } or with the subsequently injected hydrogen and functions to reduce the methane partial pressure at a given coal bed total pressure to promote methane desorption
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH