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by skwosh 3756 days ago
> Where, in any of my day-to-day job duties, ...

Off the top of my head, or at least where I've used them recently:

> kth permutation of a set of numbers?

Producing all pairs of a collection, e.g. for computing the minimum distance between elements (via map/reduce).

> clone a directed graph

Any object in an OO language (like JavaScript) is essentially a directed graph, so, cloning one of those.