{HEAD ~ A circular saw} has a housing enclosing a motor for driving an output shaft about {TAIL ~ an axis} of rotation 
{ HEAD ~ A circular saw } has a housing enclosing a motor for driving an output shaft about { TAIL ~ an axis } of rotation
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH