| You can 
      make your answer really hard to read if you use a #3 pencil.  Even 
      with a dark pencil or a pen, erasing and/or crossing out can make quite a 
      mess.  Unfortunately, some older professors are weary of eye strain and deduct 
      points for illegible answers.  The message:  Use a pen or, at 
      least, use a dark pencil.  If you have to make changes, draw a new 
      diagram. |