Controller 140 includes {HEAD ~ a matrix} of {TAIL ~ apertures}, 144, the apertures of which correspond in size and number to those of matrix 138 
of
Controller 140 includes { HEAD ~ a matrix } of { TAIL ~ apertures } , 144 , the apertures of which correspond in size and number to those of matrix 138
OTH OTH OTH 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