{HEAD ~ Deflection control structure} has {TAIL ~ holes} through which the beams may pass with a set of x y deflection electrodes associated with each of the holes for x y control of the trajectory of each of the beams 
has
{ HEAD ~ Deflection control structure } has { TAIL ~ holes } through which the beams may pass with a set of x y deflection electrodes associated with each of the holes for x y control of the trajectory of each of the beams
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH