{HEAD ~ The inert gas} is not reactive with the methane or with {TAIL ~ 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 the methane or with { TAIL ~ 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 OTH OTH OTH OTH REL TAIL TAIL 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