{HEAD ~ An object} of {TAIL ~ this invention} is to provide a thermal cracking process that is relatively highly energy efficient compared to known processes and which also provides relatively high selectivities for acetylene and ethylene 
of
{ HEAD ~ An object } of { TAIL ~ this invention } is to provide a thermal cracking process that is relatively highly energy efficient compared to known processes and which also provides relatively high selectivities for acetylene and ethylene
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