I made a group called Trusted.

What is the flag for the region to only allow the Trusted group in the area?

The only things that seem to worked are members, nonmembers, owners, and nonowners; by default - Stupid groups?

I would like the command to only allow any group Trusted+ access to the area.

So like...

/region flag (Regionname) entry-group Trusted allow

Or something straightforward like that; possible?