13.6—Promulgation of rules; publication.
After consideration of all relevant matters of fact, law, and policy, including all relevant matters presented by interested persons in the proceedings, the Commission will take such action on the proposed rule as it deems appropriate. Any rule adopted will be published in the Federal Register and the announcement of the rule will incorporate a concise statement of the rule's basis and purpose, as well as any necessary findings. Announcement will also be made in the Federal Register if a proposal is subsequently withdrawn. The required publication or service of a substantive rule shall be made not less than 30 days before its effective date, except: