[kw-pm] neat permutations trick..

[Daniel R. Allen]

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:

bash %> perl -d -e 1
  DB<1> @x = glob( "{a,b,c}{1,2,3}" )

  DB<2> x @x
0  'a1'
1  'a2'
2  'a3'
3  'b1'
4  'b2'
5  'b3'
6  'c1'
7  'c2'
8  'c3'
  DB<3> @x = <{a,b,c}{1,2,3}{doo,dah}>

  DB<4> x @x
0  'a1doo'
1  'a1dah'
2  'a2doo'
3  'a2dah'
4  'a3doo'
5  'a3dah'
6  'b1doo'
7  'b1dah'
8  'b2doo'
9  'b2dah'
10  'b3doo'
11  'b3dah'
12  'c1doo'
13  'c1dah'
14  'c2doo'
15  'c2dah'
16  'c3doo'
17  'c3dah'


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