What does it mean when a Power's effects or Target Land shows (Terrain A)(Terrain B)? A or B? A next to B?

What does it mean when a Power's effects or Target Land shows (Terrain A)(Terrain B)? A or B? A next to B?

It means "Terrain A OR Terrain B." (Back page, Targeting section.)
The division between them is supposed to be a sort of slash, but that's not especially clear.