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