{HEAD ~ The invention} relates to {TAIL ~ a process} for recovering acetylene from hydrocarbons by means of thermal cracking of hydrocarbons 
relates to
{ HEAD ~ The invention } relates to { TAIL ~ a process } for recovering acetylene from hydrocarbons by means of thermal cracking of hydrocarbons
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH