ARROWS allows you to create arrows using one of four
methods: endpoints, string, parallel, or perpendicular.
Unlike dimension entities, these entities are not 
associated with text, but are used when you want to create
dimensions or labels using separate text and arrow
entities.

Choose one of the following methods of creation:

ENDPTS  - to create an arrow on the screen by defining the
          start and endpoints.

STRING  - to create a string of arrows by assuming that
          the endpoint of one line is the starting point
          of the next.

PARALEL - to create an arrow parallel to a previously
          created line through a specified point.

PERPEND - to create an arrow from a designated point to an
          existing line entity so that the new arrow and
          the existing line are perpendicular.
