In other instances, {HEAD ~ well known structures} and devices are shown in {TAIL ~ block diagram form} in order to avoid unnecessarily obscuring the present invention 
are shown in
In other instances , { HEAD ~ well known structures } and devices are shown in { TAIL ~ block diagram form } in order to avoid unnecessarily obscuring the present invention
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH