Regular is the opposite of Strange. Strange is derived from Stranger. 
Cover is the opposite of Discover. Discover is related to Science. Science is related to Learning. Learning can cause/lead to Effectiveness. 
Regular <--Antonym--> Strange --DerivedFrom--> Stranger 
Cover <--Antonym--> Discover <--RelatedTo--> Science <--RelatedTo--> Learning --Causes--> Effectiveness 