Guard is a type of Device. Guard is a type of Act. Criticize is a type of Act. 
Must is related to Due. Due is related to Rent. Rent is related to Expense. 
Device <--IsA-- Guard --IsA--> Act <--IsA-- Criticize 
Must <--RelatedTo--> Due <--RelatedTo--> Rent <--RelatedTo--> Expense 