(1) Except as authorized in ARM 38.3.2801 tariffs of 4 pages or less may have no supplement; not more than 1 supplement may be in effect at any time to a tariff containing 5 and not more than 16 pages; not more than 2 supplements may be in effect at any time to a tariff containing 17 and not more than 80 pages; not more than 3 supplements may be in effect at any time to a tariff containing 81 and not more than 200 pages; and not more than 4 supplements may be in effect at any time to a tariff containing more than 200 pages.

(2) Except as authorized in ARM 38.3.2801 and 38.3.3301, tariffs containing 5 and not more than 12 pages may have not more than 4 pages of supplemental matter, and tariffs containing more than 12 pages may have supplemental matter aggregating not more than 33 1/3 percent of the number of pages in the tariff except that if the number of pages in the supplement which brings the volume of matter up to that authorized by the rule is not evenly divisible by 4, it may exceed the volume authorized to the extent necessary to bring the number of pages of such supplement to the next multiple of 4. The smallest of 3 effective supplements to a tariff of more than 80, but not more than 200 pages shall contain not more than 8 pages, and the smallest of 4 effective supplements to a tariff of more than 200 pages shall contain not more than 16 pages.

(3) The provisions of the first and second paragraphs of this rule will also apply to tariffs filed prior to 12/31/72.