Alternatively, {TAIL ~ a stirring means} can be used, such as a rotating prop or {HEAD ~ blade} 
Alternatively , { TAIL ~ a stirring means } can be used , such as a rotating prop or { HEAD ~ blade }
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD