Average is related to Excellent. Excellent is a synonym of Brilliant. Brilliant is a synonym of Wonderful. 
Method is a synonym of Way. Tail can be used for Way. Tail is related to Extension. 
Average <--RelatedTo--> Excellent <--Synonym--> Brilliant <--Synonym--> Wonderful 
Method <--Synonym--> Way <--UsedFor-- Tail <--RelatedTo--> Extension 