{HEAD ~ The control} of {TAIL ~ the switch position} may be manual or may be controlled by a central processing unit 10 
of
{ HEAD ~ The control } of { TAIL ~ the switch position } may be manual or may be controlled by a central processing unit 10
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH