You could do something like:

@a= glob "{a,b,c,d,e,1,2,3,4,5}"x 2;
for(@a){print "$_ "}
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(but using the full set of characters and numbers that you want and varying the multiplier. And I guess you mean permutations.)
chas
(Oh, zaxo posted the same idea, more detail, while I was typing...)