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Note KY1: Weakens Earthquake: Section 1613.3.3 did not require irregular structures to use Ss values exceeding 1.5. This expands the limitation of ASCE 7 12.8.1.3. Section 1613.3.5 does not require Risk Category I and II buildings with S1 greater than or equal to 0.75 to be SDC E. (9/20/19)