I need help to build a ACL with habtm

For my application I need a ACL with habtm.
In my book "Webentwicklung mit CakePHP" there´s only an example with a
hasMany relation.

I can't find anything I the web belonging to ACL and habtm (with the
ACL of cakePHP and no custom solutions).

For testing purposes I only have a simple aco tree:
ROOT
Fileuploads
index

Building the aco tree:
cake acl create aco / ROOT
cake acl create aco ROOT Fileuploads
cake acl create aco Fileuploads index

And a simple aro tree:
[1] Gruppen

Building the aro tree:
cake acl create aro / Gruppen

So I have 3 tabels:
users
usergroups
usergroups_users

Can anyone help?
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