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Enumerative combinatorics, graph theory, order theory, posets, matroids, designs and other discrete structures. It also includes algebraic, analytic and probabilistic combinatorics.

-1 votes

Uniquely generate all permutations of three digits that sum to a particular value?

This maybe overkill, but here is my generalized algorithm: http://nbviewer.ipython.org/gist/denfromufa/61b3ed4e902fd9d11d6a
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