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