Link between Android Permissions and Permission Groups

Question

I an new to Android Development. I was looking at the android manifest permissions. There are two things. Permissions and Permission Groups. I know that the list at

Answer 1

As far as I Know: Manifest.permission_group*AB* = Manifest.permission*A* + Manifest.permission*B* take a look at this instance:

android.permission-group.MESSAGES = SEND_SMS + WRITE_SMS + RECEIVE_SMS + READ_SMS + BROADCAST_SMS

I hope you get the idea.