DecentHolograms permission

In this screenshot, you can see two holograms overlap, what im trying to do is implement a feature where you can only see one of the lines if you're in a specific group. The cyan text you see is a line 1 hologram text, and it should only be visible to players who are in a group called dead. The white one is a line 2 hologram text, and players who are NOT ind the group dead should see it. How do i go about this?