Thus, {HEAD ~ a desired time varying pattern} of {TAIL ~ energization} of the conductors to accomplish a control function, e.g. the control of a central heating system to provide different heat outputs at different times of the day, can be set up at will simply by adjusting the various switches  
of
Thus , { HEAD ~ a desired time varying pattern } of { TAIL ~ energization } of the conductors to accomplish a control function , e.g. the control of a central heating system to provide different heat outputs at different times of the day , can be set up at will simply by adjusting the various switches
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH