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