Extracting word list considering affixes

Hello aspell user group,

Need your advice. I'm trying to extract a list of all words from aspen
russian dictionary. I googled a bit and found this one:

http://superuser.com/questions/137957/how-to-convert-aspell-dictionary-to-simple-list-of-words

aspell -d pl dump master | aspell -l pl expand > my.dict


The thing is words it produces are ending with question mark [?] which I
suppose means that some substitution left to be done (like affix). Is there
a way to get all the words including the ones different by affixes?

Thanks in advance,
Alex