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Simulating atomic objects other than registers. The WaitFreeHierarchy: levels 1, 2, and ∞. Readings: Herlihy, Wait-free synchronization, TOPLAS 13(1):124-149, but see also Jayanti, Robust wait-free hierarchies, JACM 44(4):592-614, 1997 and Ruppert, Determining consensus numbers, SICOMP 30(4):1156-1168, 2000.