Retail is a type of Sell. Sell is a type of Persuade. Pain can be used for Persuade. 
Ongoing is a synonym of Continuous. Continuous is derived from Continue. Continue is related to Resume. 
Retail --IsA--> Sell --IsA--> Persuade <--UsedFor-- Pain 
Ongoing <--Synonym--> Continuous --DerivedFrom--> Continue <--RelatedTo--> Resume 