Legal is related to Permit. Permit is related to Driving. Parking is a type of Driving. Parking is the opposite of Garden. 
Ordinary is related to Usual. Usual is the opposite of Strange. 
Legal <--RelatedTo--> Permit <--RelatedTo--> Driving <--IsA-- Parking <--Antonym--> Garden 
Ordinary <--RelatedTo--> Usual <--Antonym--> Strange 