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SummaryThe problem of sampling with probability proportional to a measure of size and with certain requirements for the probabilities of joint selection of pairs of units has a history that goes back to about 1943. However, although more than 50 articles on the subject have been published none of them has given a completely satisfactory solution and none of them has emerged, at least for sample sizes greater than two, as a practical alternative to the usual method of systematic sampling with probability proportional to size. The solution given in this paper is exact, simple and intuitively appealing.