Combinator
From the site:
The usage of Combinator class is very simple. It takes the input array of items and defined size (combination number) of combination arrays that can be produced in a loop.
Suppose we need to generate all three-number combinations from numbers 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. We put them in array, instantiate the Combinator and call its next() method in a loop until there are no combinations left.
http://lharp.net/post/array-combinator/
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