The power source E1 consists of {HEAD ~ two groups} of {TAIL ~ cells} connected in parallel with each other, each group consisting of five 1.5 volt cells in series 
The power source E1 consists of { HEAD ~ two groups } of { TAIL ~ cells } connected in parallel with each other , each group consisting of five 1.5 volt cells in series
OTH OTH OTH OTH OTH OTH 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