HNORM                                                      Menu:(HELPL) ADHLP
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Creates a help-line perpendicular to a specified plane, through a specified
point.

  1. (POINT) first point of plane
  2. (POINT) second point of plane
  3. (POINT) third point of plane
  4.*(POINT) through point

Description:

This command creates a help-line through a given point, perpendicular
to a specified plane. Pick three points to define the plane. Pick the point
through which the help-line passes. The perpendicular help-line is created.
You are prompted for additional "through points" until you enter another
command.
