Extent is derived from Extend. Extend is a type of Be. Sell is a type of Be. Sell is related to Rent. 
Dominant is a type of Note. Note is a type of Air. 
Extent --DerivedFrom--> Extend --IsA--> Be <--IsA-- Sell <--RelatedTo--> Rent 
Dominant --IsA--> Note --IsA--> Air 