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