The motor is powered by a power supply, e.g., {HEAD ~ a battery pack}, located within {TAIL ~ the housing} 
located within
The motor is powered by a power supply , e.g. , { HEAD ~ a battery pack } , located within { TAIL ~ the housing }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL