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