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Features of the original document layout such as columns, tables, line and letter spacing, pagination, and margins will not be preserved in the text version. If you need the complete document, download the WordPerfect version or Adobe Acrobat version, if available. Section 31.8 of Part 31 of the Commission's accounting rules prescribes the list of retirement units that should be used by the carriers. In lieu of the retirement units prescribed in Section 31.8 with respect to a particular account, a carrier may, after obtaining specific approval by the Commission, establish and maintain its own list of retirement units for a portion or all of the plant in any such account. The considerations underlying the selection of items as retirement units shall be submitted for Commission approval.