The lettering guide is mounted upon the planar surface for rectilinear movement along {HEAD ~ a plurality} of {TAIL ~ parallel steps} 
of
The lettering guide is mounted upon the planar surface for rectilinear movement along { HEAD ~ a plurality } of { TAIL ~ parallel steps }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL