{HEAD ~ The preferred mode} for operating the novel process of this invention is to use {TAIL ~ a fixed bed} of catalysts either in a two bed arrangement or in sequential catalyst stages in one bed 
is to use
{ HEAD ~ The preferred mode } for operating the novel process of this invention is to use { TAIL ~ a fixed bed } of catalysts either in a two bed arrangement or in sequential catalyst stages in one bed
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH