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