I am trying to generate an exhaustive list of SMILES codes, including their repetitions.
permutations are reorderings, i.e. samples without replacement. You seem to want all possible samples with replacement, i.e. variations_with_repetition.

In reply to Re^3: all permutations of given lenght by Anonymous Monk
in thread all permutations of given lenght by cataclismic_user

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