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Stirling Numbers of the Second Kind
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Determine the number of ways to partition a set of N objects into K non-empty subsets.
Examples
N: 2
K: 1
Result: 1 ({1, 2} => {{{1}, {2}}})
N: 3
K: 2
Result: 3 ({1, 2, 3} => {{{1, 2}, {3}}, {{1, 3}, {...