ipfw in freebsd 4.7

[vlad]

Hello!

      I have FreeBSD 4.7 installed.
      I need to add this rule into firewall:
ipfw add divert 10000 ip from  {not a.b.c.d/nn or not e.f.g.h/yy} to
i.j.k.l/zz via ed0

but ipfw answers me:
host '{' is unknown.
I readed man page about grouping carefull, but cannot add this rule
into firewall table.

Can anyone explain this ipfw behavior?
I cannot split this rule into two separated...
waiting yours solution.

Please, make copy of your answer to my email.
-- 
Best regards,
 vlad                          mailto:vlad at sas.nsk.su