{HEAD ~ Control signal} 47 may be supplied by {TAIL ~ control path} 18, a schematic diagram of which is shown in FIG 4 in accordance with an embodiment of the present invention 
{ HEAD ~ Control signal } 47 may be supplied by { TAIL ~ control path } 18 , a schematic diagram of which is shown in FIG 4 in accordance with an embodiment of the present invention
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH