Whether a combination of 'extraordinary and compelling reasons' under 18 U.S.C. § 3582(c)(1)(A) can include grounds for sentence vacatur and whether district courts may consider First Step Act sentencing disparities in evaluating such reasons

(1) WHETHER A COMBINATION OF "EXTRAORDINARY AND COMPELLING REASONS" THAT MAY WARRANT A DISCRETIONARY SENTENCE REDUCTION UNDER 18 U.S.C. § 3582(c)U) (A)'CAN INCLUDE REASONS THAT MAY ALSO BE ALLEGED AS GROUNDS FOR VACATUR OF A SENTENCE UNDER 28 U.S.C. § 2255. (2) WHETHER, AS FOUR CIRCUITS PERMIT BUT SIX OTHERS PROHIBIT A DISTRICT COURT MAY CONSIDER DISPARITIES CREATED BY THE FIRST STEP ACT'S PROSPECTIVE CHANGES IN SENTENCING LAW WHEN DECIDING IF "EXTRAORDINARY AND COMPELLING REASONS" WARRANT A SENTENCE REDUCTION UNDER 18 U.S.C. § 3582(c)!)(A) .