Stirling number of the second kind
A surname.
A device that alters the aerodynamics of an airplane, glider etc, allowing it to descend quickly but safely, especially when caught in a thermal
(mathematics) The number of ways to partition a set of n objects into k non-empty subsets, denoted by S(n,k).
A box used to keep provisions cool
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DiQt（ディクト）
無料
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