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 the case of an embodiment that uses {HEAD ~ a count} down {TAIL ~ counter} to reach a predetermined count 
down
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 the case of an embodiment that uses { HEAD ~ a count } down { TAIL ~ 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 OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH