{HEAD ~ The method} 14 or 15 wherein {TAIL ~ the step} of selectively generating said signal comprises the steps of: 
wherein
{ HEAD ~ The method } 14 or 15 wherein { TAIL ~ the step } of selectively generating said signal comprises the steps of :
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH