{HEAD ~ The invention} employs {TAIL ~ a high frequency transformer coupling technique} for pacing, or, alternatively, high frequency transformer coupling with modulation demodulation 
employs
{ HEAD ~ The invention } employs { TAIL ~ a high frequency transformer coupling technique } for pacing , or , alternatively , high frequency transformer coupling with modulation demodulation
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH