a motor coupled to the impeller, the motor to rotate {HEAD ~ the impeller} to pump {TAIL ~ a liquid coolant} 
a motor coupled to the impeller , the motor to rotate { HEAD ~ the impeller } to pump { TAIL ~ a liquid coolant }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL