A Phase 1b, Open Label, Global, Multicenter, Dose Determination, Randomized Dose Expansion Study to Determine the Maximum Tolerated Dose, Assess the Safety and Tolerability, Pharmacokinetics and Preliminary Efficacy of Iberdomide (CC-220) in Combination With R-CHOP-21 and CC-99282 in Combination With R-CHOP-21 for Subjects With Previously Untreated Aggressive B-cell Lymphoma | Arctuva