{HEAD ~ The combustion gases} generated during the combustion are collected and purified in {TAIL ~ a separating member} by separation of solid material from the combustion gases 
are purified in
{ HEAD ~ The combustion gases } generated during the combustion are collected and purified in { TAIL ~ a separating member } by separation of solid material from the combustion gases
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH