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I wish to check something to ensure I have it right, regarding the membergroups.

I have my own rank groups which are post count based groups.  To these groups I've not granted any general permissions.
I also have three special membergroups. 

Cambridge-ites, Charlesonians, Diana-ites, these are regular groups.  I've also not granted them any permissions, however regular members have permissions and therefore would I be right to assume that the permissions granted to regular members WILL apply to these three regular groups?