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Core ruination, utter failure, complete devastation, intractable destruction, or any other extremely undesirable outcome resulting from an event never seen coming or seemingly so unlikely as to warrant no [consideration] in the first place. Such occurrences have popularly become known as 'black swans'. The word is derived from kurtosis, used in statistics to measure the likelihood of extremely unlikely events. A higher kurtosis value indicates that extreme events constitute a higher proportion of the possible outcomes [associated] with any given event, though this can only be discerned after such events occur. This is more commonly known as the 'fat-tail' of a probability [distribution].
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