to this:
A fairy tale about a car that drawn a pencil from the car is an ideotentest for humanitarianists.
because :
AutoCAD itself, automatically, will not replace the wrong letter with the correct one.
In the presence of the correct drawing, the pencil copy is made elementarly:
The finished drawing is placed on the glass.
A light source (lamp) is placed under the glass.
- clean wattman from the top - and a line with a pencil in the hand, to circumvent the light.

exactly. Thus created readings were called "squeeze", the sample - " goat", and the "appliance" for manufacture - a glassed box with lamps inside - proudly named "coslotron" :) personally worked on such, in 1988.