{TAIL ~ an electrical energy source} to charge said electrical circuit, said {HEAD ~ electrical energy source} having an electrical output means 
{ TAIL ~ an electrical energy source } to charge said electrical circuit , said { HEAD ~ electrical energy source } having an electrical output means
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH