{HEAD ~ The switching frequency} has {TAIL ~ an audible frequency range} that results in unacceptable audible noise that is reduced by the present invention 
has
{ HEAD ~ The switching frequency } has { TAIL ~ an audible frequency range } that results in unacceptable audible noise that is reduced by the present invention
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH