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