Creating my own little dictionary and using it in conjunction with aspell's big dictionary

Dear Folks,

I have aspell 0.50.5 on my Mac running OSX 10.3.9.
The following give me a list of misspelled words in a file line-by-line:

          alias spell "cat \!* | aspell -l --mode=noe | sort -u" ;  
spell input-file > mispelled-and-not-recognised

I edit  this file and delete all misspelled words and save the file  
as `not-recognized'
So far so good.

I remember that on my old SGI there was a `spellin' utility that  
converted this list to some hash table and
added it to the original big dictionary, or something like that.
I was looking for how to do this with aspell but i haven't met any  
success.
I've tried the following:

          aspell --lang=en_GB create master ./base < not-recognized

and this created a special file with all the not-recognized words,  
lots of nulls and other special characters.
I thought that this was my not-recognized list in aspell's dictionary  
format, but now I am not sure that this is the case.

Next I tried a lot of versions of this:

        alias spell "cat \!* | aspell -l -mode=none --extra-dicts=./ 
base | sort -u"

with --add, with extra-dicts, and whatever I could think of. I got a  
lot of error messages that I could not put to good use,
some worked exactly the same way as the first spell alias: agains my  
expectations it listed the formerly not recognized words again.


Could you please lend me a hand in this?

Thank you

Miklos Somogyi