Random nucleotide string generator?

All,
 
Is there a random generator for creating nucleotides (of length l with composition frequencies a, c, g, and t) in there somewhere?
 
I noticed a thread about it from 2000 and nothing since (searching for "random sequence").
 
If not - what should the namespace be for such a module should it be undone and desirable?
 
TIA!
 
Roger
 
 
 
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