Three states not mutually exclusive?

The military plane can be inspected, partlyinspected, or uninspected. 

This isn’t working the way I expect, and I just want to clarify one thing before I drive myself nuts looking for bugs.

The compiler didn’t like

The military plane can be [b]either[/b] inspected, partlyinspected, or uninspected. 

Which makes me suspect that states in sets of three aren’t mutually exclusive. It would explain my problem, but my code is getting big, so there’s a chance it’s some other problem too.

In any multi-state property, the states are always mutually exclusive. If you say “A plane can be inspected, partlyinspected, or uninspected,” then the plane can only be one of those things at any given time.