control statements are DS to start the definition of a subroutine, DF to finish thedefinition of a subroutine, DD to delete the definition of subroutines, 0 through 9 toinclude additional user-specified information, and END to terminate a CIF file.All of these keywords are usually abbreviated to one or two letters that are unique.

Geometry

The LAYER statement (or the letter L) sets the mask layer to be usedfor all subsequent

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