{HEAD ~ These openings} 518 allow {TAIL ~ a cooling medium} to flow through the passage 516, which assists in removing heat from the coils 306 a,b 
allow
{ HEAD ~ These openings } 518 allow { TAIL ~ a cooling medium } to flow through the passage 516 , which assists in removing heat from the coils 306 a , b
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH