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