{HEAD ~ A surprising finding} underlying {TAIL ~ this aspect} of the invention is that it is possible, using for instance a nitrogen purge, to displace essentially all of the oxygen from the bed in a co current purge step, without desorbing any of the adsorbed inert gas 
{ HEAD ~ A surprising finding } underlying { TAIL ~ this aspect } of the invention is that it is possible , using for instance a nitrogen purge , to displace essentially all of the oxygen from the bed in a co current purge step , without desorbing any of the adsorbed inert gas
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