Bank is a type of Act. Bank is related to Save. Save is a type of Prevent. 
Written is the opposite of Oral. Oral is a type of Examination. Examination is related to Doctor. Doctor is related to Officer. 
Act <--IsA-- Bank <--RelatedTo--> Save --IsA--> Prevent 
Written <--Antonym--> Oral --IsA--> Examination <--RelatedTo--> Doctor <--RelatedTo--> Officer 