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Definition: they have the property that they often rise and fall in unpredictable patterns, which is somehow analogous to the process that forms hailstones.
Source: Reges & Stepp, 2007
Example: Example sentence for context: "A hailstone sequence is a sequence of numbers in which each value x is followed by either: (3x+1), if x is odd, (x/2), if x is even."