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Zipf's law was formulated regarding word-frequency in languages, stating that the frequencies of a language's most common words are proportioned 1 to 1/2 to 1/3 to 1/4 to 1/5 and so on. The notion was explored by linguist George Kinsley Zipf, and such a probability distribution is termed a Zipfian distribution. This basic sequence of frequency-proportions has been observed in numerous languages. The same sequence has observed in non-linguistic circumstances, and is candidate in characterizing the statistics of sample data under study. Sometimes modifications of this general idea are used, such as adding a constant. Analogous continuous probability distributions are also a possibility.