Person does not want (to) Tragedy. Person does not want (to) Disappointment. Disappointment is related to Fail. Fail is a type of Change. 
you are likely to find System in/at/on Shop. System is related to Weight. Weight is related to Diet. Diet is related to Regime. 
Tragedy <--NotDesires-- Person --NotDesires--> Disappointment <--RelatedTo--> Fail --IsA--> Change 
Shop <--AtLocation-- System <--RelatedTo--> Weight <--RelatedTo--> Diet <--RelatedTo--> Regime 