It will be appreciated that the step of resetting counter 40 could also be a step of presetting the counter to a predetermined number, for example in {TAIL ~ the case} of an embodiment that uses a count down {HEAD ~ counter} to reach a predetermined count 
It will be appreciated that the step of resetting counter 40 could also be a step of presetting the counter to a predetermined number , for example in { TAIL ~ the case } of an embodiment that uses a count down { HEAD ~ counter } to reach a predetermined count
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH