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> 
> Cleaning out some old files, I stumbled over this paper I wrote for you about five years ago.  I don't know if you ever got it, so I'm sending it to you now as an attachment.  It may be a little dated but still accurate--at the time there was some discussion of what kind of beast SW was, alphabet or whatever.   
> Please let me know if you get this OK. Also, new email address if anybody wants it.   
> 
> --Joe Martin