Scramble is a type of Change. Switch is a type of Change. 
Debut is a type of Perform. Debut is a type of Presentation. Presentation is a synonym of Introduction. Introduction is a synonym of Preliminary. 
Scramble --IsA--> Change <--IsA-- Switch 
Perform <--IsA-- Debut --IsA--> Presentation <--Synonym--> Introduction <--Synonym--> Preliminary 