[kw-pm] neat permutations trick..

[Andrew Kohlsmith]

> When I tried this in the meeting, I could've sworn I'd tried the same
> parameters, but anyway, both of these work; they are un-documented
> features of perl's filename expansions, that don't actually require any
> files to match, but return a valid array.  Courtesy toronto.pm:

[ snipped ]

Could we have that again please, perhaps in English?  I'm having trouble 
seeing the utility.

Regards,
Andrew