{HEAD ~ The process} 6, wherein {TAIL ~ the angle} of movement about the pivot is about 60° 
{ HEAD ~ The process } 6 , wherein { TAIL ~ the angle } of movement about the pivot is about 60 °
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH