20 pages. "This rule is intended to modernize the methodology used to determine de minimis lump sums in terminated underfunded single-employer plans. Specifically, PBGC is adopting the interest and mortality assumptions from section 417(e)(3) of the Internal Revenue Code for this purpose. It also discontinues PBGC's monthly calculation and publication of interest rate assumptions. Because some private-sector plans use PBGC's lump sum interest rates, the rule provides a table for plans to use to determine interest assumptions in accordance with PBGC's historical methodology."