What does "spell" do wrong?

[Jacob Wilbrink]

I've been wondering what the program "spell" does, since it
seems to make very many errors. Some examples of words it thinks
are spelled correctly are

utomsrr
mgdesou
aneorxx

How does "spell" ever derive those words by adding inflections,
prefixes and suffixes to words in the dictionary?

Please e-mail responses to jaap%chromo at ucscc.ucsc.edu
or cmph000 at ucscj.ucsc.edu.

Thanks.