OPINION
BERCH, Chief Justice.
¶ 1 An Arizona administrative rule provides that a physician should rate an injured worker's impairment using standards set forth in the "most recent edition" of the American Medical Association Guides to the Evaluation of Permanent Impairment (AMA Guides). Ariz. Admin. Code (A.A.C.) R20-5-113(B). We must determine whether "most recent edition" refers to the edition that was most recent when the Rule was promulgated (the...
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