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