Arrange is a synonym of Set. Set is a synonym of Mark. Mark is a synonym of Inform. Introduce is a type of Inform. 
Widespread is a synonym of Mainstream. Mainstream is a synonym of Usual. Usual is the opposite of Unusual. Unusual is a synonym of Different. 
Arrange <--Synonym--> Set <--Synonym--> Mark <--Synonym--> Inform <--IsA-- Introduce 
Widespread <--Synonym--> Mainstream <--Synonym--> Usual <--Antonym--> Unusual <--Synonym--> Different 