Generating all combinations of length X in an array

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On Wednesday, 8 April 2015 at 11:08:00 UTC, wobbles wrote:
> On Wednesday, 8 April 2015 at 10:54:45 UTC, bearophile wrote:
>> wobbles:
> Thanks, all the D stuff on rosettacode is an excellent resource!

He's likely not the *only* contributor but I think bearophile is 
the big D champion there. <3