{HEAD ~ The engine} is oriented with {TAIL ~ its crankshaft} vertically extending, such that the engine has a top and a bottom, a first end and a second end, and a side between the ends 
{ HEAD ~ The engine } is oriented with { TAIL ~ its crankshaft } vertically extending , such that the engine has a top and a bottom , a first end and a second end , and a side between the ends
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH