{HEAD ~ The power generation process} 4 wherein {TAIL ~ the stream} of steam is passed through a body of oil 
wherein
{ HEAD ~ The power generation process } 4 wherein { TAIL ~ the stream } of steam is passed through a body of oil
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH