{HEAD ~ A pair} of blowers 83, 83, blow cooling air over {TAIL ~ heat sinks} 82, 82 
{ HEAD ~ A pair } of blowers 83 , 83 , blow cooling air over { TAIL ~ heat sinks } 82 , 82
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH