However, such signals are not shown here in order to more clearly highlight the signals which are essential to {HEAD ~ the understanding} of {TAIL ~ the present invention} 
of
However , such signals are not shown here in order to more clearly highlight the signals which are essential to { HEAD ~ the understanding } of { TAIL ~ the present invention }
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 TAIL TAIL