{HEAD ~ An alternative method} of {TAIL ~ line selection} is illustrated in FIG 20 in which the switch panel contains only 4 switches 61, 63, 63, 64 and a line count display 65 
of
{ HEAD ~ An alternative method } of { TAIL ~ line selection } is illustrated in FIG 20 in which the switch panel contains only 4 switches 61 , 63 , 63 , 64 and a line count display 65
HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH OTH OTH