a common anode contact at which the respective anodes of {HEAD ~ all} of {TAIL ~ said extraction diodes} are connected together 
of
a common anode contact at which the respective anodes of { HEAD ~ all } of { TAIL ~ said extraction diodes } are connected together
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH