(1.7) What should I do if I don't have all the groups in the hierarchy?

If your site does not carry some of the subgroups in the hierarchy
that you wish to read, you can send email to the Usenet newsgroups
mainatainer at your site and request them to start carrying the
those subgroup(s) at your site. If you do not know how to contact
that person, you can try sending email to :
  news@name_of_your_domain
  usenet@name_of_your_domain
  news@news.name_of_your_domain or other similar variations.

If all these fail, you can try sending a bug report from your
newsreader.

Good luck.