{HEAD ~ A method} for the storage of hydrogen within a subterranean solid carbonaceous formation such as {TAIL ~ a coal seam} 
{ HEAD ~ A method } for the storage of hydrogen within a subterranean solid carbonaceous formation such as { TAIL ~ a coal seam }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL