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We design a variation of skip lists that performs well for generally biased access sequences. Given n items, each with a positive weight w i , 1 ≤ i ≤ n, the time to access item i is O wi; the data structure is dynamic. We present deterministic and randomized variations, which are nearly identical; the deterministic one simply ensures the balance condition that the randomized one achieves probabilistically. We use the same method to analyze both. Search(X, i). Determine if i is in X. Insert(X,doi:10.1007/s00453-004-1138-6 fatcat:dlpg24hye5cbhlkhxvb5zx44oq