{TAIL ~ The arm} rotates about axis A with an angular range of {HEAD ~ rotation} of the order of 60 degrees 
{ TAIL ~ The arm } rotates about axis A with an angular range of { HEAD ~ rotation } of the order of 60 degrees
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH