A contour is defined as a line that expresses points of equal elevation.

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Contour Rules

1. Contour lines will never touch or intersect.
   
2. Contour lines are continuous.
   A contour line never simply ends, it continues until it intersects with itself at another point. Occasionally, a contour may appear to terminate at a wall or curb. However, the contour simply runs along the face of the wall or contour until it intercepts the line at another place.
   
3.