A search of the Lounge failed to turn up any code for extracting all possible combinations of a given collection taken n at a time. I created the attached workbook with VBA code as a passtime activity.
On my machine it will handle a collection of 24 items taken 11 at a time in 100 seconds. The same collection taken 12 at a time causes the machine to run out of memory while trying to redimension an array to 2.7 million by 12.
Enjoy; and feel free to criticize.
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